I don't know, I've already missed a lot of great events such as the 15 free stones, skill up events, God events, etc. Plus, it's a bit of a hassle. And I don't think I have the time to juggle two accounts.
I don't know, I think I'll keep at the US version for a while. If we don't get an update after another month or two, I'll switch. Seriously, we're in desperate need of one :/