I've been using versiosn 3 sine the first beta and the early ones where a little unstable, but since beta 3 (i think) I haven't had a problem. havn't noticed a memory leak havn't noticed a cpu strain (mine runs at 100% always anyway)Its far superior to 2 (or at least it will be). support for multiple playlist is excellent
personaly the only thing I don't like about it at the moment is you can't edit tags with it, and it doesn't display some of my tags from some mp3s properly, basicaly it sounds great and its looks fantastic .
only a few skins avaliable, some suck but others are great. only get ones designed for beta 3 nothing earlier