I've put on a Tsubaki Sigma chain about a year ago, and I don't remember readjusting it.(maybe old timers desease is setting in) It must not stretch much, so other than cleaning and lubing once in awhile its been matenance free. Actully it was readjusted after chainging chains a couple of times. While doing track days, I switch to a RK racing chain and a bigger rear sprocket.But the Tsubaki was never really loose when I made the switch. So far I've used DID,EK,RK,O-ring chains, and I think the Tsubaki Sigma O-ring is holding up the best. I'll have to check and see how many miles are on it,I have it logged into my manual. I don't use a oiler,and I don't think it will be this year when I see how many miles befor its ready for a change.(especially now that I'm driving 2 bikes) But I'll give a update later down the road.
Dan