i configured my keys so it is very similar to unreal tournament (melee is /, reload is ', spacebar is switch weapons, e is still enter vehicles and whatnot).
and it transfered onto the PC very well. the graphics are much better on a PC monitor anyway.
and zaku was right, with my friend id fly at him with a banshee and hed turn around and blow me to bits. and when i was sniping he looked up at my screen and said "aw shit i better get inside". however now, banshee whoring is big, that invisibility thing is a lot more useful, and sniping ACTUALLY WORKS.
-edit-
one other thing i forgot to note on is when playing on the PC, you can type messages up to other people unlike xbox. thats really something to be happy about.