Gremlins, actually.
Anyway, some thoughts: It seems to me that all Dreamcast triggers I've used have eventually developed some kind of squeek after heavy use, but they all still work great. I agree that the Saturn/Genesis 6-buttons were the best, the model 2 saturn controllers are still my favorite. The Sony "d-pad" (more like d-buttons) is very irritating for certain games, and their analogs require practically no force to move, so they are either down or up for me (not good for FPS!). I like the controller-S for Xbox, and it is quite solid. However, although I got used to the location of start/back pretty quickly, I still sometimes fumble for the white/black buttons in games that don't use them often. It wasn't a problem while I was playing KOTOR though.
On a side note, I was disappointed with Sonic Heroes, and I wasn't even expecting all that much. Sonic Adventure was way better, graphics aside. Although, 720p support is nothing to sneeze at. I think I'm going to see if the Japanese voices are any better, or I'm going to strangle Tails and Big... and although it was funny at first, I'm tired of hearing him addressed as "Mr. Big". The joke wears thin after 1000 times of hearing "Let Mr. Big handle this!".