Sounds great, it has a DSP mode which I prefer off, it boosts the bass and some of the top end but I feel the mids really suffer, it sounds great flat, just EQ it at the mixer.
This is about the highest SPL you will find under £500 and it really shows, top quality speaker a second will surely find its way to me in the not too distant future.
For guitar/vocals don't even think about a sub unless you want to go really loud, if you're mic-ing drums then sure. Also makes a great speaker for that cinema feeling at home!