I've never had any issues with my VP150, and the QS8's are simply the best surround speaker I've ever experienced.

I bought a 2-channel amp and a pair of M2i's to make the leap from 5.1 to 7.1 a couple years back. After about a month, I took the M2i's down and now use them as computer speakers. Sold the amp. The QS8's do such a dang good job as surrounds there was really no point of adding two more speakers to the year.