I am still on V1 at the moment as V2 is just unusable to me. I have tried it out a few times, but it makes me physically ill. The differences in looks are not just the UI, the actual pictures, colours, contrast, jaggedness is different, and with that is someting like how often the scene refreshes or redraws, I would love to know what changes were made in those sort of areas. What I mean by physically ill, is that I have narcolepsy, and it has similar triggers as epilepsy for some things, after at most an hour on V2, I have to log off and go lie down for ages until I feel better, so not a great SL experience.
I hate using 3rd party viewers, because if you have trouble with anything, the first thing they ask is what are you using, and if it is a 3rd party viewer tough luck as it is obviously that. I am slowly stepping into V3 now and then, but can't say yet if it is doing many as I have gone in on that one very very briefly.
Oh btw, when you go from V2 back to V1, you get all the damn help messages like you have just started, can't remember if V3 does it. Can and how do you turn that off?