Paul
I haven't used a TT but all reports seem to say they're very good. The only ST I've used is the G51 and it's been exceptionally good. I've replaced its muffler with a Bolly CF after muffler which saved about 3 ounces of nose weight . The Chinese ST's are at least as good as the older Italian made ones (as they should be because they're still owned by the Italians). OS are priced high because they have to pay for all the massive advertising they do, it doesn't mean they're better. In fact, they're not good at all when it comes to long life.