Got my modded clutch back earlier this week and just had the chance to get it back together and put some miles on it. After reading everything I was expecting a massive difference and wasn't disappointed. Mine's a K2 with over 30,000 miles on it and the mod has absolutely transformed the way it rides.
I've only had the bike a month or two and so glad that I didn't wait to get it done. It's a must-do in my opinion and for the price and ease of the job, a no brainer.
Also the service/comms from John was really good throughout.