I recently got stuck in V3 by accident. It took a while to find my way back to V2. V3 totally sucked. It was dark, hard to find anything and when I tried to comment in a thread by quoting someone, it didn't post. I really don't see the attraction of it.
It's like anything - V3 looks & feels slightly different, and because you can't find anything that you used to know where to find in V2, you feel cranky and just switch back. V3 finally gave me some nice features that I quite liked, so I stuck with it, and now I use it for all of my Admin stuff - the only reason I still use V2 occasionally is that there are spam blogs that only show up under V2, and once the launch goes public, that's not going to be an issue any more.
I recently got stuck in V3 by accident. It took a while to find my way back to V2. V3 totally sucked. It was dark, hard to find anything and when I tried to comment in a thread by quoting someone, it didn't post. I really don't see the attraction of it.