MU is a great game. Its fun, Cheep and has some pretty cool features
though its version 1.5 makes it a little bit of a let down its still great for the devoted.
Being so popular its no surprise that there is some Private servers.
these servers have all of the things from the orrigonal and more, for example those who just couldn't wait for season 2 to fully come out used the emulator on one of the Asian versions.
now this has its obviece disadvantage of translation issues and stuff.
and then there is servers like Alliance Mu which stick with the current updates of the English mu and just up the exp gain and drop success rate etc
in the whole mu is an awesome alternative to wow and is a great game