Also had John's clutch basket mod done last summer. My UK registered SV1000n had a bad case of the chudder, and after doing the valve clearances / syncing throttle bodies, flashing the ecu for a slightly richer low end, and still having the problem, I took the plunge and send my basket off to John for modification. The difference has been night and day, and 4k miles later the bike is still one of the smoothest v-twins I've had the pleasure of riding. Without a doubt this is the best mod I've done to the bike, and John's service was first class and super professional. Ten out of ten!
Tim