wouldn't hurt. also some people are reporting less lag in the sms typing and other little things. Also if your screen is pretty yellow, it'll fix that (not guaranteed though).
I haven't bothered doing it. The only thing I have heard that it possibly fixes is the yellowing effect (even some say it doesn't fix it though). So I don't think there is any point to upgrading to it.
Just wait for 2.0.1.
I was going to get 347 by an iTunes restore but then I read that some people have claimed it *increases* lag etc. I can't see a yellow tint on my screen and I have no lag, so I'm leaving it as it is!
yeah i don't have a yellow screen or any of that, but i am having problems with the sync from mobileme calendar to my iphone. i can't seem to get it to sync properly.