
EX2 has some famously gunchy buttons. To make things even gunchier, my girlfriend spilled some soda all up in them. We removed 'em and soaked 'em in rubbing alcohol, not much help. She went ahead and bought some Sanwa buttons. They were a bitch to get in there, but we got it all set, and now the biggest problem with the EX2 is fixed. And I have a second stick again for other people to use while I use my TE.
They aren't kidding when they say it's a pain to mod, though!