Admittedly, I only have around 100 miles on my gebe as of yet, BUT, I am so impressed. To date they are the tops. They have taken the previous hundred years of motored bike technology and distilled it down to the positives from those, and done away with the negatives. I was curious as to the drive ring being 'plastic' and the thin little drive belt, I'll admit to being sceptical, but once received and realizing the belt was kevlar, and the drive ring an aerospace composite, not 'plastic' (as such), It eased my mind a little. I know people personally with thousands of trouble free miles on these systems.
I know the engine I use is top of the line, as Tanaka has 75 years experience and are one of the best in the small engines market. I hope to log more miles in the next few months and really put it through the paces, so as to get through my break-in period, and try some of the performance parts to see what that will do. Though the parts are top quality, and I fully support the transmission/drivetrain components being made in America, and supporting American entrepreneurs, I'm not sure I like the proprietary drive belt, for if I'm in the middle of nowhere and need to replace it I'm stuck until a new one can be ordered and shipped, rather than scrounging through a local hardware supply, or auto parts store.
Overall I give this kit two thumbs up, and an "Above Average" score.
Also forgot to state that the customer service was top notch as well, all the folks I spoke with over the phone were friendly, professional, and concise with answers to my questions.