Happy with Mirage Omnican 6
I also selected the Mirage Omnican 6 as an in-ceiling surround (purchased on the Internet for ~$150 a speaker). I found that they were very straightforward to install. Since I'm in the middle of retro-fitting my family room for an on-wall LCD and hidden speaker wires, etc., I just hooked up the speakers to my receiver so I can listed to music as I work on the other parts of the project.
I'm really, really impressed with how good they sound! In fact, I'm starting to wonder about just getting three more of them and using them as the main and center channel speakers...