I got a Scottoiler on one of my bikes but don't have enough miles on it yet to form an opinion and I don't know much about other brands so not much help there. One thought on your chains, have you been replacing sprockets too? The teeth on a worn sprocket will be out of sync with a new chain and trash it in short order.
Also, chain life depends on the kind of riding you're doing. If you're in the dirt and wet and mud 10,000 miles is OK.