Although they say they are not reusable the 10 Speed SRAM power locks are, just a bit fiddly to take off.
How to Remove a Black Sram PowerLock from a 10 Speed Chain - YouTube
I use an adjustable pair of pliers rather than a channel lock in the vid, as I don't have one. I generally replace them when I change the chain and have never had one break on me after reuse.
I have used them on both Shimano and SRAM chains no problem, I do usually carry a spare just in case I have any sort of chain problem, Having said that it's only a few bucks to replace them so no big deal.
I have to travel 15miles to get KMC stuff (the LBS is only 400 yards away that sells SRAM / Shimano) - only reason I haven't tried them