Background:
I was looking for a solid pair of planar headphones for awhile and found these which looked perfect. I picked them up on sale and discount for a great deal.

Opinion:
They've absolutely knocked it out of the park in sound and build quality, so they're becoming a mainstay in my collection. I'd certainly recommend these to anyone on sale so long as you have the equipment to drive them (they're fairly beefy). The Velour pads they come with are definitely my preference in terms of comfort.

Pros:
Fantastic Sound
- Well defined sound, signature of Planar Magnetics
- Decent Bass even for planars, but could be tuned with EQ
Build Quality
Earpad Variety, coming with both leather and velour
Solid cables
Hardshell case for transport

I don't have really anything negative to say about these, however be aware of:

Size: Huge headphones, biggest I've ever held personally)
Weight: I don't have the exact weight, but due to the materials it's no surprise but they are HEAVY for a pair of headphones but they're built well. You definitely get your moneys worth in that regard.

Don't judge the headphones until you try the velour pads vs the pleather. I was actually about to return the headphones when I saw a suggestion to switch to the velour pads online. The velour pads are physically warmer, they don't look as nice - but once I changed to them the sound improve tremendously. I stopped trying to equalize out issues with the pleather pads.

First closed-back headphones. Not sure how much noise isolation they're supposed to give, but the M1570 is not impressive in this regard.

It's really heavy. Not recommended for glasses wearers, but that might go for over ear headphones in general. The weight transfers to your glasses, pressing down into your nose bridge.

Sound is V-shaped, though I still put a 10db bass shelf on it. I recommend EQ, but I EQ everything I have, so there's that.

I wouldn't purchase this at 600 USD. But when it's on a good discount, and if you don't have a closed-back planar? It's not a bad choice.

Really good headphones. Bass, soundstage, and highs are top notch. Vocals are a bit recessed. Overall im really enjoying these headphones.

So far pretty good . Haven't had too much time to go through my library but what I'm hearing is a pleasant surprise . I got my headphone amp about the same time as the cans and that helped the sound quality some . Waiting on the dac now to finish the set and to make a final opinion after listening for a couple weeks . These are the first planar cans for me and I never spent more than $300 on headphones like wireless sennhieser and V- Moda . The pads on these are a good 4in across and they are big but , they are comfortable .

Excellent headphones, brilliant quality, clarity and and precision.

Sound awesome

There's a lot I like:

- sound is good. I'm not going to waffle on about the large soundscape or whatever, but I really like this for my music. I never miss anything. On the contrary, I sometimes hear things that I don't hear on my speakers. It certainly sounds better than previous headphones, like a Sennheiser HD-580, HD-599 and an Oppo PM3. On this basis alone, I give it 5 stars.
- it has a certain heft to it
- my ears fit
- the price, especially when it's on offer < US$ 400, is excellent

There are some things I don't like:

- the plugs from the cables are long enough to often touch my collar/hood
- all my sources have 3.5 mm plugs, and the adapter in the package is very long, which makes using it risky. So I had to order an AliExpress cable
- I'm not sure how monoprice US and monoprice EU are related, but I can't fathom why it's only sold in the US. Shipping was painless.

Pretty incredible headphones for the price. I'd expect a little less creaking from the headband given the price, but the drivers sound wonderful and despite its weight, it's a very comfortable pair of headphones.

BUILD/COMFORT: these are definitely heavy but very well built. All metal and nice leather. The weight doesn?t bother me. The comfort is great overall. 4/5

BASS: the bass extends deep and has great quality/texture. The only area where it?s a bit lacking to me personally is impact; however, this is most likely due to the standard nature of planars. I believe you?d have to get into the $1000+ range for better bass. I?m a huge basshead and these absolutely satisfy with a bit of a boost through my ifi xbass and schiit Loki. 4/5

MIDS: These have a great midrange. I would probably describe these headphones as being mid-forward. They have more weight and musicality to this than my hifiman ananda. Those actually seem to sound more recessed/veiled and thin in the mids than these. I think the m1570c is tuned very well. 5/5

TREBLE: I would not describe these as dark at all, but not bright either. The treble is basically perfect to me. There?s great extension and detail here. Very smooth and inoffensive while not lacking in detail or being sibilant. 5/5

SOUNDSTAGE/IMAGING: The soundstage isn?t huge, but it?s not small and intimate either. It?s actually quite excellent for a closed back and has a great amount of range. Vocalists and the mids typically come forward while the rest of the mix is placed around as expected. It?s very balanced 3D-wise without too much height, width, or forward/rear depth dominating. The sound is nice and holographically balanced. The smaller nature compared to my ananda also makes the sound a bit richer and more musical. These are also my favorite headphones of all time for gaming too. 5/5

DETAIL: Detail retrieval is excellent. Separation is not as extreme as it is on something like my ananda, but it?s not lacking any info compared to that. It?s a bit easier to see the details on the ananda but they are still all there on the m1570c. The imaging/soundstage combined with the detail provide a very enjoyable listening experience. 5/5

OVERALL: These are excellent headphones. I believe they?re probably competitive in the $1000+ range and you?d have to probably get something like an LCD-XC for marginal improvements. I was absolutely smitten with my ananda when I got it, but doing A/B comparisons with the m1570c really shows how good it really is. Makes me consider selling the ananda since these are better in many areas and have the benefit of being closed back, which is required for most of my listening. I picked these up on sale for $400 and I don?t think there is anything closed that can compete at all. I used an emu teak for all my past closed-back listening but these are definitely a large step ahead in ever area except bass impact, I couldn?t recommend them more if you need a closed back in the ~$500 price range. 5/5

Also note: they definitely improved after 50 hrs. or so. Burn in is real with these.