I've listened to two sets (different power ratings) in the same room/system. I can't say that they're world class, but they were good. They had several major problems when compared with a BEL amp. However, I am not writing to bash the sound of the amp. No matter what we heard, the amps are very well made and should have normal used equipment resale values.
The bottom line is if you like it, buy it.
Not sure if this helps...but hey, it was free. :-)