After reading mixed reviews, I was a bit skeptical, but no regret, now I'm glad that I chose this amp! It looks robust and even nice in the pro sense. Relatively small and light for the power, good for touring. I bought 2, to be able to make tri-amp stereo, but because the pairs can be individually bridged, it is flexible and can be used in many different setups. I tested sound quality with my 600Wpk DIY beyma-18sound-b&c speaker, with the bass part in bridge config. In this tri-amp DSP setup I could test frequency ranges also separately bass-mid-high and found all sound good, strong and pleasant. Fan noise is negligible for a kW range amp, you don't need this power in a silent living room, where it could be a problem. I measured the output power at 4.3 and 8.6 Ohm resistive load. I got 48 and 60 Vrms, meaning 536 and 419 W, with static sine wave. At 4.3 Ohm, the limiter is a bit conservative and slowly (10-20 ms) reduces the output to this value, but with 50% AM signal it can be seen, that the amp is capable of much more power before the limiter acts, so there's enough headroom with real music signal to meet the spec. At 8.6 Ohm the limiter doesn't act, the amp clips at around 177Vpp. If the amp proves to be reliable for years, this will be one of my best purchases! Based on my current experience, I can strongly recommend it for PA!