I've only just unpacked my new Ev ZLX 12P and haven't really had time to road test it yet. On first impressions and without 'pushing' the level, the sound quality isn't the best I've heard (I also use a QSC K10 which sounds better) but for the price bracket it's a beast. Just be warned that as with any of these types of units, the louder you go the more the quality diminishes, oh and watch out for that 'Fletcher Munson Curve'.
All n' all, I'm very happy with it for DJing at small venues.
*Update... I pushed this unit at a party last weekend and it didn't really stand up (as I expected) Although this was at an open air event, under cover but not enough for much absorption. So I guess living in a country where most of my gigs are outside, perhaps next time I will be inclined to spend a bit more to get that bit of extra sound quality at high levels. I still maintain it's not at all bad for the money and for small parties or venues.