I'll have to discuss it with our group. But overall, it took us quite some time to learn the rules as they are. We're just now really getting the hang of it, and "balance" issues haven't even been a problem yet.
We'll see. That will require everybody in the group to get the new PH, but some of them are couples, so they share. I think we'd be looking at 4 PHs, 3 DMGs and 3 MMs. That's $400.
And THEN I have to work out (minor) conversions for all the other books we have, whereas if we keep with 3.0e, I don't have to do any of that.