I during my search noted some folks that complained of hydroplaning with the Kuhmo as it wore.
In fairness, others have commented the opposite on the Kuhmo regarding hydroplaning.
I have noted however no complaints on the S Drive, although admittedly fewer are running it.
Mine should be installed this week and we will be on a 4,000 mile trip next month, so I will too report my opinion.
I will say, aside from wear, I had no issues at all with any of the OEM Kendas on the rear of the Spyder. Near us the dealer charges about 300-400 for the Kenda tire and installation, and considering the mileage before it needs to be replaced adds up to approx. .20 per mile to operate the Kenda, I decided to try the S Drive. Also to me the S Drive has a similar tread design.
Good Luck.