I have a 7.1 system with Center and fronts NOT in ceiling (they are behind the screen) and the rest are Sony SPC8 in-ceiling. I also have two sub woofers. The main design objective (from my wife) of 'no cables have to be seen was accomplished.
Sound is (almost) as good as my old install in Texas where I had a dedicated theater room with bi-poles after some adjustments. Amplifier (in both cases) is an Outlaw 1070 (
http://www.outlawaudio.com/products/1070.html)