Product review (2 stars): Is nice....if it was smaller
This was partly my fault because I didn't think about the wall cavity.  The dryer vent in our house runs through an interior wall and up into the attic.  I wanted to install the lint trap IN the wall.  The problem is that the wall was built with 2x4's, and this box is about 7 or 8" long.  It might fit in a 2x8, but nothing smaller than that.

I think I will end up installing the box between the dryer and the elbow that goes into the wall.  Either that or the attic, but I don't want to climb up there everytime I want to clean it out.

The other thing is that it's made out of a rough feeling sheet metal.  While it's new, it looks a little beat up and had a few rubbed areas on the cover part.  The picture here makes it look nicer than it is.

I haven't installed it yet, but I'm sure that it will do the trick.  I'll just have to get a little creative with it.