I have a Shimano CS-M771-10 cassette and it shifts better with the Shimano CN-HG95. I tried KMC and went back to Shimano. I also like the pin for the Shimano 10 speed chain compared to the KMC quick link. I never take my chain off for cleaning, so the reusable quick link was a waste. I also found out that the quick link will be the weak link in trying to get a chain to high mileage. At around 3500 miles the quick link pins had worn out the holes in the chain and the rollers were shot also. All the other links were fine. With a quick link you are putting two pins into holes in the chain that are not as tight as a pin(and you are only pinning one hole when using the Shimano pin). Never tried the Wippermann Connex, it might have better tolerances.