I have 10 years now, and I never had no problems with it!
The overall opinion is positive trs: quasiement his hi-fi, even low volume, no volumes with white noise background, color of its fairly neutral, trs good momentum.
The quality is always that of QSC: say anything, it's tough stuff. Ventilation trs silent and efficient (very rarely in high-speed).
The protections are the height (short juice, saturation, overheating). Personally, even if it is robust trs, I did not have fun throwing the money truck to test it ... Others are loaded it for me with their ... and the test is clear: rsiste treatment of turn!
It is not that it supports the same loads 2 ohms, o the quality of the circuits and the margin of tolrance ...
I use it with 3-way 400W speakers Montarbo / 103dBm, the record is good and trs trs prcis
The report qualitprix trs is good, it is ready for a life of artist ...
Exprience with this amp, let alone new MODELS, I would do without this choice hsitation!