I've run VM34s from MMM for about 5 years now with no problems. Michael set them up and I just did a little fine tuning. I wasn't a huge fan of the 2-1 throttle cable, but other than that it was a great setup. It does seem like I have to mess with them more than the old diaphragm carbs. I usually tune up early in the season around april, tune again when the hot humid weather hits, and then again in the cool dry fall. Really only playing with idle speed and mixture though. I ended up buying the VMs after rebuilding and battling with the stock carbs (and missing a lot of the early riding season) but pretty sure that was my own mechanical shortcomings at the time. Still have two sets of the stock carbs sitting on the bench.....