I met two guys yesterday who had "thumb" throttles yesterday. One was a 426 so I gave it a spin. I have no clue how they ride like that! His 2000 426 had the hesitation from hell. So you push the button and then two seconds later ...waaaap. Its hard enough to hang on to a 426. Try to do it with your thumb NOT wrapped around the grip! His buddy on a yz 250 smoke had it too. I asked why and they told some story about a friend braking their wrist.I was kinda like stories people tell you about someone who died in a car wreck and it was the seatbelts fault. Just thought I would share this wierdness. No offense if someone in here has the same setup.