last time i had few fwens played TW WoTLK (dun ask, they chicken out) before i started mine and got its client to play on 1 pc while another pc download and updating WoTLK
the trick is fiddle the realmlist.wtf file to point to TW server, and get some plugins for chinese translation (which a retired barth dude that owed me all his gold that he poses had told me about, since his guild is a
gold selling farmer chinese guild... ) for the current english version.
TW WoW might be slightly:
1. outdated becoz patching is done by 3rd party, like blizz and WoW CN (ok, that's a messy scenario...)
2. bigger file size, becoz unicode is 2x the size of normal us/eu keys (including zombie keys)
basically the settings are the same except...
1. names, it's all bricks and blocks

, i feel like playing tetris...
2. players - i remembered when my fwen (jeles with his full pvp set) landed in tanaris and attempt to acquire heals from a paladin to buffer the tanaris mobs while he tried to kill a warlock, that paladin 1 button macro chickened out... 2v1 mang... he chickened out!!!
3. skill analysis - all in bricks and blocks... i'm playing tetris...
and lastly...
not much LYN members in TW servers to halp joo with quests, golds, mats, raids and paybacks when few peeps ganked you.