I run KMC and Shimano. I've had a KMC X10.93 fail on 3 links whereas the X10.SLs have been flawless and last well. I've used Dura Ace, 105 and Ultegra and they're all fine except the finish is a bit dull. If you want a nice shiny (and expensive) chain go for an X10.SL in silver, but the Shimano ones are fine if you're not concerned about looks.