I used these in a reno, I liked the idea of 4 gang. Having used them I would have adjusted my design to include more support. Mostly on the "non-mounting side" The pics of the product will complete that sentence. It does have plenty of space to accept cables though, in one of mine I have 2 HDMI cables ( the big ones from monoprice) 1 Component, stereo RCA's, 2 network cables, optical toslink and rg6 coax.
I have 10 Monoprice 12ga cables plus some other cables in a bundle that will be fed through this bracket. That proved to much for the holes on the backside, so I cut the back off with a tablesaw. The plastic is too thick to cut through without power tools. I don't consider this much of a negative, because I like the overall structure and it should work without modification in most applications. Still, nothing I've seen is as good as this when it comes to larger brackets.
PROS: Very rigid bracket, won't flex at all. Has holes to keep conduit and cables in place on the backside.
CONS: It does take up the full depth of a standard 2x4 stud wall. This may be a problem with large cables bundles.