The sticks can drift over time which you would have to open up the controller to fix by cleaning the sticks. The left stick specifically has a snapback issue where letting go of the stick after it's fully extended causes it to every so slightly hit the opposite direction from where it was held. In short, if you were trying dash towards your opponent and jump in, you could end up jumping towards them in the opposite direction, which ofc isn't ideal if you were trying to rush/punish with a forward air or neutral air. You can mod the controller to have the snapback manually removed, but it's a ton of work. I nearly paid about $30 bucks for a controller with a snapback capacitor because of how annoying it was to me. Snapback makes half of Bowser's kill confirms nigh impossible.
But if your current setup is just a sideways Wii-Mote? You can really only go up from there, the Ultimate GC feels great and the snapback is very situational and character dependent. I'd say go for it.
EDIT: Oh, is this for Brawl? In that case it would depend on how Brawl reads deadzones I guess. I don't know much about the game, sorry.
