I had teh SXa100's and they DO sound good, but the hiss drove me nuts. Even in the off position, the amp hisses. Maybe my hearing is ultra sensitive because I've always been carefull to never be in front of my mains, but in quiet settings, the hiss is just awful. As soon as you get to stage volume - you can overcome it, but it's still there when it gets quiet again.
The 100's also tend to splat if you don't use a sub woofer with them. They are great in the mid range, but the lows don't really throw as far as the competition. Not great for modern bass and drum sounds. Great for traditional jazz and standard stuff though.