I used to ride a 2006 Majesty, which I installed the JC into and rode it for 10k miles before I sold it. The variator raised the revs pretty across the board, unless I was really light with the throttle. It gave considerably improved low and mid range acceleration, smoothing out juddering or hesitation. Top speed I never got to test, as I was never on long enough of a road to see what it would peg the speedo at, but I got up to 90mph before I ran out of road. I can't remember what the maximum revs it was able to achieve, but it consistently could rev 500-1000 what it normally would do in stock mode. I never hit the rev limiter with the JC, but it got close to red line, which I forget what it was. At highway cruising speeds, it did settle down a bit. Gas mileage did go down 2-3mpg driving conservatively and more if driven aggressively. I never had a problem like what I've read others have experienced with the JC; bell housing cracking, bushing failure, etc., but I think I was at the end of the life on the weights when I got rid of the bike. I've also have been contemplating DP sliders for my TMax or the Malossi Multivar 2000 variator. From what I've read in the Malossi manual, you can tune the performance with different weight combo's. Tourist, sport and race. The TMax variator takes 8 rollers total. The Malossi kit provides 2 different weighted sets of 8 rollers. For the tourist setting, you use all 8 of the heavier weights; for the sport setting, you use 4 of each of the different weights, alternating their placement order; in the race setting (with modified exhaust) you use all 8 of the lighter rollers. It also gives 2 shims to put between the half pulley and the hub of the variator to widen the gap for the belt to drop toward the drive shaft more, in effect giving a lower gear ratio to start from which gives even better acceleration and performance than rollers alone. With 2 complete sets of rollers, if you run the sport setting, you have another complete set or rollers as a replacement, effectively doubling the service life before needing to purchase more rollers. The only thing that isn't explained is what Tourist, Sport and Race configurations are like compared to stock. This kit is supposed to be for Sport use on the street and not racing. I'm talking to MalossiUSA asking them all kinds of questions.