I own what's in my signature, R500 mains, R200c center, R100 as surrounds in a 5.1 system and a pair of iQ10's as L-R mains in my upstairs guest bedroom 5.1 system. My son has Q500 mains, Q200c center, Q800ds surrounds and Q300 rears in a 7.1 system.
The Uni-Q tweeters are really good. They're not bright one bit, if fact a bit laid-back at the very highest frequencies. Soundstage isn't as big as Klipsch Reference Premier, but far more depth to it. I can get up to about 30º to 40º off-axis without major penalty in sound quality, same for my son.