It's not when you are playing that fans are a problem, it's when you stop to do something else.
I took delivery of the PS2 today and the fan is always on and audible. It looks like it is quite a small fan, shame they couldn't use something a little bigger and quieter. I wouldn't say there was much in the fan noise between the PS2 and the Waza TAE - the only difference being that the Waza fan comes on when needed, whereas the PS2 fan is always on.
the other thing I've noticed with the PS2 is transformer hum like you get on a real amp (no real surprise there as it's got valves).
Very early days, I'm not rushing to judge it just yet and will keep testing.