I’m very impressed with the sound quality of these IEMs there is nothing on the market this nice for thing value. Time will tell how the hold up. Was also quite surprised by the professional packaging. My only complaint is the cable. I would prefer something stiffer and shapeable and there is no way to snug the IEMs to my head as the cuff is in the wrong place. But quality out ways the inconvenience in this case. Bought these on a trial/error bases on a recommendation, and I’m glad I did. Would recommend.

I was coming from 1BA+1DD, cost $23 and they sound great. I saw these on sale and grabbed a pair, expecting a huge jump in sound quality. From the beginning, they sound kind of "stale". Not flat, just boring. Maybe it's the cross-over, maybe it's the BA's... I'm glad I got them on sale...

Great value. Although there are naturally better sounding ear buds out there, these sound real good for price. The main thing I was looking for was better bass response than what I was using for in-ear monitors while playing with the band, and these do the trick!

Just one little thing is that they get tangled really easy, but they fit well in my ears and deliver what I need.

The sound seems to cover both ends of the frequency range. Wish the cables were more robust as they get tangled easily.
The ear piece takes getting used too.
Overall, I’m pleased because the sound is
first class.

I wanted a set of in-ear monitors but didn't want to break the bank. These sound very good and if you get them on sale, you can't beat the price for in-ears of this quality.

Look familiar ? You know the deal if you know Monoprice!!!
But as always MP delivers, quality and price. If you know BQEYZ sound signature then you know these and they Rock!!!! Erik

These have great sound out of a compact package! Easily the best earbuds at this price-point. They are not too bass-heavy and have allowed me to hear nuances that I previously could only hear with my good over-the-ear cans. These have become my go-to earbuds for commuting and for travelling.

Trying to describe sound over text is completely impossible, but I'm about to so it anyway. This is my first time purchasing iem's, so some salt may be taken.
I'm currently running these with Fiio's BTR5 with an upgraded 2.5mm balanced cable via the BTR5's Bluetooth hi-fi system.
These are the best all round listening device I have ever owned. The bass and sub-bass is present and powerful, (I say this having used Nura's own phones and loops as dailys for some time, both of which have irresponsible amounts of bass boosting if you want) but never overwhelming. The highs are sparkling, clear, and pushed to the front. The mids response is amazing, with clear detail throughout the mid-range, differentiating hi-mid and low-mid both in tone and space.
Everything sounds good through these; from highly produced niche electronic tracks, indie pop, funk rock, soul, classic and modern jazz, soundtracks, classical, metal, rock, and everything else.
I know better IEM's are out there, but for the price of entry, the amount of kit you're getting with that price, and the way these sound... i don't know that I'll want to upgrade for some time.

Overall these are excellent at any price. At their normal Monoprice price they are an incredible bargain. If you are lucky enough to get them on the occasional sale they are just absolutely amazing. These sound great. The 5 drivers per ear are well tuned and balanced.

Pros:
Sound amazing. You just get lost in the music. Deep bass, balanced across spectrum, great sound stage.
Good build quality, fits ear well, reasonably comfortable to wear. Look good.
Good quality cables with standard connector allowing high-end replacements if desired, or Bluetooth options.
Impressive unboxing experience (some people seem to care about this, I don’t quite get it – you end up putting the box away or even throwing it away)
Very efficient –can be driven directly from most sources

Cons:
Cheap velvet bag as a carrying case
Cable could be better – especially the plastic that holds the wire around the ear
A better selection of ear tips included
Only modest sound isolation
I’m not sure if a con or a pro – these are so good they reveal poor recordings. They are best with high quality, high resolution recordings.

I purchased these and the MP80s on sale at the same time. These are better.

As with most IEMs, a good seal is essential. It seems that it is even more important with these. The silicone eartips that are included were OK. I was able to find a pair that gave a good seal. That did take some minor effort, and did require really pushing the eartip into the ear canal. I have since replaced the original silicone eartips with Dekoni foam tips. Those are better, but I will likely find a suitable pair of Comply tips. Note that the Quintet nozzle measures a straight 5.93 mm OD with no flange that is more typical. The included eartips have an ID of 4.5 mm. Monoprice doesn’t specify this anywhere, I measured them with digital calipers.

Once you have that seal though, these sound simply amazing. They have amazingly deep bass without being overwhelming, and still able to have very balanced mid-bass, mids, and highs. The low bass is truly impressive, with response better than any other IEM or over-ear full headphone I have (I have a ridiculous amount). The result is just amazing. The earphones feel like they just vanish and you are immersed in the music. Every detail of the music is just there. You hear the differences in recordings, including poor microphones, and other details that just weren’t apparent with other earphones. Good, high quality, high-resolution recordings really come through though. Streaming Master Quality Authenticated titles on Tidal with a DAC that supports MQA really reveals how good these are.

As I wrote above, the best part of the way these sound is that the seem to disappear. After a while you are just lost in the music. The deep drum or bass, the smooth vocal, the percussion or drums, they are all balanced and natural. Natural, yet sound amazing. They have a wide, detailed sound stage. The deep bass is tight and balanced, not overbearing.

They are only mediocre with sound isolation though. With either the stock eartips or even with the foam tips, the isolation isn’t fantastic I tried using them on the London Underground. They worked, and sounded quite good, but they weren’t up to isolating all the various noises of the station or the train.

These do fit well in the ear. While they are a bit heavier than many other IEMs, they are comfortable enough to wear for extended periods. While some other reviews complain a bit about build quality, I don’t agree. These are made of quality aluminum and are well made.

The cables seem just fine to me. The wire appears to be of good quality. The wire has minimal microphonics. The inline microphone works, I can’t say much more than that about it. It has a single button. The biggest fault I have is the way they wrap around the ear. The plastic in that portion ends up tickling or bother my ear at times. If this really bothers you though, the cable is replaceable with a standard 2-pin connector. Compatible high-end or even Bluetooth cables are available.

These are very efficient and don’t take much power to drive. Almost any reasonable source should be able to drive them adequately. Initially I was using them with the Monoprice Monolith USB DAC 29512. They do sound really very good with that DAC. However, what is even better, works great with these, and sounds better, especially with MQA content is the MQA enabled version of the Zorloo Ztella.

I bought the MP-80s at the same time. These are better.

These definitely compare well to headphones costing thousands of dollars more.

I had a lot more details but had to cut the review to under 5000 characters. Why monoprice?

I was looking for some premium earbuds and didn't want to break the bank. The multiple driver aspect of this product is what sold me and wow do they sound great. I used to have some Ultimate Ears UE11 earbuds (they cost over $1,000) and while these are just a step below that, it's not that far behind! Vocals are clear and it handles bass with ease.

Great build quality and solid audio performance.