I am overall very happy with this product. It's very well built, all aluminum column and thick glass shelves. It's a very sturdy product.
The assembly was quick and easy, took all of 10 minutes before I was ready to start mounting. As other reviewers stated you do need a second person. I could have attempted it alone but it would have surely been frustrating trying to hold the all three shelves steady and screw the rod together would be quite a task. Mounting on the wall was straight forward but again required two people, one to hold and one to secure the shelf to the wall mount.
My receiver barley fits on the self like some other reviews i read. It's a standard Dolby digital 5.1 standalone receiver. about 3 years old. The feet are on it completely so that's all that really matters i guess. I don't know that I would want the selves much larger, they stick out from the wall quite a bit as it is.
I have a receiver, DirecTV HD DVR, PS3 and a Wii on the shelf system and they fit nicely with all the cables running through the cable management channel with room to spare. I think there is enough room left to squeeze even a power plug through there with a little work. My cable count is 2x HDMI (FLAT), 1x Optical, 1x Coax Audio, 6x standard gauge speaker wire, 1x Coax Satellite cable, 1x Wii component cable, 4x power cords for each of the 4 devices.
Also one other thing, I bought this to mount next to my TV on the wall not under it. I was worried that it would look funny since the TV is supposed to cover the top, but since I have a ledge around my basement wall I can't mount it below the TV. It looks quite nice as a stand alone wall shelf just to the left.
All in all i'm a happy customer!