I also jumped into an aircooled with a 915. I hated the OEM shifter, was really nerve wracking that I can bang into 2nd instead of 4th, etc etc.
Went with a WEVO, learned how to adjust my transmission coupler, never been happier. Really crisp and refined shifting. Reverse lockout is awesome. The shifter "standing up" in 3rd/4th give it a really nice feel, you won't ever bang into a wrong gear.
Also - definitely do a fluid change.
GO FOR IT!
And unlike spuggy - I sure as hell can't shift into first without crunching gears at any speed above a crawl