I used this box when renovating my basement, and have it installed behind my flatscreen TV. I ran two 2" conduits to it (the other ends are accessible from another unfinished room, allowing me to run more cables later). I also installed power directly in the box, using a retrofit electrical box (which is what the instructions recommend doing). I have 2 HDMI cables, a component, an audio+composite, and power coming out of it currently I would agree with another reviewer that the rubber gasket is pretty stiff, but it definitely works, and I don't have to deal with it often enough for it to matter, really.
The biggest downside is that the box is somewhat flimsy. I mounted it right on a stud, but still had to reinforce it with a couple extra screws near the back. I think if you were doing a retrofit mount with it (installing after drywall), the four corners being screwed down to the drywall would hold it steady enough, but that won't work if you put it in before the drywall (you have to cut off the flaps that would otherwise hold it to be able to get the drywall in place.
The box itself is somewhat rigid, but all in all it is a little flimsy. This was overcome by mounting the box against a stud, so no points off for me. I got black because it disappears behind the screen. The big reason that this scores an 8 versus a 9 or 10 is that the rubber area on front where the wires comes through is extremely rigid and unforgiving with the wiring. if you are using one or two HDMI wires, then it will be OK. In my situation, I had the Plasma TV power cord, and two component cables. In essense, this is 7 cables, and with a low profile mount, I had to bring them all to virtually the same opening. The rubber cover makes it hard to manuever the wiring even though it has 3 starburst slits in it. I would prefer to see more of a brush material that allows mutliple wires to come through. If you are using a low-profile mount (a couple-incher) I would probably go with a box that is truly recessed without the rubber cover since my wiring is pretty much at a 90 angle with this box. I do not believe Monoprice carries this style of box, but I hope they do in the future.
This is really neat product which allows you to use a single cable from source to component - in my case receiver to TV - and avoids any loss of signal strength by having several connections and several cables to do the same thing. Also, if you are installing this before you put up your walls you can run a string or two between two boxes to allow you to add more or different cables between your components. These were the deciding factors in going with these boxes over cables and plates. The box can also be mounted in existing walls if you are considering this option. The black cover gives the finished product a very professional look when everthing is wired up, and reduces a lot of clutter. My biggest complaint about this box is that the housing is made out of plastic and is very flimsy and did not hold shape very well while installing it. It is made of a soft ABS plastic that would also break very easily if you push it too much. I was hoping that the housing would have been a little more rigid. A metal housing would have been better. Otherwise I am satisfied with this product.