Worth the Price
Installed these along with a set of the CDT5800 when I was finishing my basement. I can say that the combination of the speaker enclosure and the speakers themselves sound fantastic. I am running them as my rear channel in a 5.1.2 setup. If you are doing in ceiling speakers spend the extra money and get the enclosure, do it right the first time, it can't hurt. I did have to add some wood bracing in the ceiling so that I had something to screw into when I installed them. I also took it a step further and added some sound insulation above and around the speaker box, just to help prevent sound transfer to the first floor.
Pros: Great fit, awesome quality, serves its purpose