"...one cambridge rep who owned it said it was under powered a bit. "

This was my reaction when I tried my brother-in law's P500 in my 2-channel setup which is in a very large open floorplan. However, in his room, which is about 15% larger than what you describe, it is more than adequate. The thing that impressed me most was how well it integrated with my Apogee Calipers, which is not an easy task for any sub.

"... I am skeptical on Cambridge though and think that their are better out there. I think like Bose and Boston Acoustics Cambridge has seen its golden age come and go."
I've had others say this to me too. Maybe this is based on products like the Basscubes, which seem to be just average, if that. My personal experience is just the opposite. In the past, I had Ensembles and the old Ambiance speakers in secondary systems, but would never have considered them as a primary system. I returned the Towers by Henry Kloss after the trial period, too boomy and seriously lacking detail. Not Kloss' best work IMO. However, the "Newton Series" products have impressed me enough to try them myself. I did an in home HT system shootout between CSW, Definitive, Paradigm, Infinity and B&W two years ago and to my surprise I ended up keeping the CSW. I still use my old Apogee ribbons and Ed Meitner amps in the 2 ch system, but my CSW T500 based HT system impresses me more and more everytime I use it.

Of course from what I hear, the Rockets are pretty darn good too!