I hope you will not force Chinese users to use the 'Chinese version'. What I hope more is that you just don't store any data in China. Even if users can choose which server to use, it is still not safe for Chinese users, because Chinese government is known for polluting DNS, resolving DNS to the IP it prefers, a server under its control. There will be no security for Chinese users at all. Check the comments on Chinese news sites. Almost everyone is saying, if Evernote stores data in China, they will stopping using Evernote and delete everything. If you insist on storing data in China, I don't know if you will gain any new users, but I'm sure you will lose many existing users. Please! Please reconsider. Never store any data in China!