Bought new in 2007, used for 2 years and sold for as much disappointed by Yamaha ... Why?
1 - infernal noise of the fan for one musician Home-Studio! (For the Live Bar in one loud, it can go ...)
2 - Reverb Crappy (I confirm!)
3 - The carrying case purchased Yamaha 100 € option sold after 3 use "soft"
Since mono 250W version is released with cooling fins (without noise so) SPX reverb and better, so you now know that it is better to avoid the 300 and the 500 as well (I think, because even noise problem) ...
News: 2 versions 400 and 600W (SPX reverb better) just made their entrance, so watch the fan noise (I do not know, nobody talks about it ...)
Otherwise, high reliability electronic Yamaha for the rest of the gear acquired.
Well, I hope this review will help you in your choice ...