First off, I use this for my guitar set up (don't ask), so I can't comment on it's use as a PA amp.
Really well built, incredibly neat internals, solid dials with detents so you can easily match volumes on each channel. Separate XLR and jack inputs, which is nice - Speakon outputs are a pain for guitar setups, but if you're setting up a PA that makes sense.
I think it has inbuilt overcurrent/heat protection, but I can't say for sure because it's never kicked in. It works, it's as loud as I need.
Only down point is that the fan is always on, full speed. The fan that came with it was pretty noisy (you wouldn't hear it at normal PA volumes, but for quiet guitar playing I could). I switch it out for a bigger, slower fan with a speed controller and it's now effectively silent.