The new Q series consisting of Q100, Q300, Q500, Q900, Q200C & Q600c are a complete departure from the old Q series.
All of the above have received postive feedback professional & end user combined. Most notable being the Q300 & Q900.
I have a 5.0 setup of Q900 + Q600C & Q300 that I use as surrounds. I have yet to hook up the rears but I am running the fronts for the cheap thrill of it so far in the 2 movies I have seen they appear like a giant wall of sound in the front. If you go with the Q900 do not buy the older series as they will not be timbre matched.