Like with all amps and preamps I need an additional EQ (or two) but then the clean sound of this little amp is VERY good (about as good as several other TUBE preamps/amps and far best of all of the dozens of none-tube preamps/amps I ever used and had). In contrast with many other recent class-D amps, this one does not need/have a cooling fan (and no cooling fan noise, at all). Crunch sounds are less convincing. Lead sounds can sing well, but rather narrow range of sounds. Reverb is quite fine for a built-in one (but, of course, most external reverb units mostly are far better). For what I mostly need (clean, noise-free, just a hint of reverb) it is VERY GOOD. Really, jazz players do not need more than this unit and an additional EQ (I use MXR)... oh, yes, and maybe also a guitar and speaker cabinet (closed back, please).