Well, I have yet to finish off my stokers, lol, but rather I do or not I plan on getting these for the Death Valley ride next month. Over the last couple months I have read my eyes blind about tires and I can't seem to find a better tire for klr style off road use yet still able to scrape pegs in the twisties. After putting them at the top of my list I met some riders around here who swear by them after going through all sorts of brands and styles they say these are the only tires they will ride. Everything I read to what I am told they seem to average about 5k miles on the rear with hard riding both hwy pounding and crazy off roading (these guys are crazy impossible to keep up with offroad). They are similar to the 606s everyone raves about with a bit shorter knobbies and a bit firmer compound from what I gather.
One of the guys I am riding to DV with runs 606s and has had the T63 and likes them equally. He said if I stick with him I will be adding over 1k miles just going to DV and back. If anything I figure they are a good set for my first pick off the stockers and for DV.