Most of your wet clutch problems will come from the oil you choose to run in your machine later down the road. The wet clutches for the most part work pretty good, they lock up hard and wear slow. You absolutely *MUST* run wet clutch safe oil, don't take another bike owners word for it that this brand or that brand is fine just because they said so. If you're in doubt stick with what the manufacturer tells you to run and don't deviate..
The problem is oils not designed for wet clutch setups usually have friction modifiers, and likely have the words "Energy Conserving" near / on the SAE label.
After replacing a couple wet clutches I just stick to the OEM oil and here's why:
1) I quit having to replace wet clutches
2) My oil stays clean sooo much longer.. Before with other (internet) recommended oils my oil was dirty and black after one ride.. I can only assume this was my wet clutch wearing out faster than normal.. Now I can go 5-6 rides before even thinking about my oil.
This is what a wet clutch looks like from running the WRONG oil.
Those bare metal marks there are where friction material used to be, you'll notice almost immediately with a wrong oil that something feels off... you'll notice a bit more takeoff lag which will turn into a lot of take off lag, which turns into the engine turning a ton of rpm's and barely moving. It won't take long either, the wrong oil (regular engine oil) will smoke your wet clutch in under an hour.
Other oils can take longer to do the same thing and leave you wondering but if your oil is dirty and black after every ride then you'll be replacing a wet clutch sooner rather than later.
*Edit* And I concur with Greenkitty, buy only OEM belts and stay away from all of the aftermarket ones!