One of the guy racing Mirko (messnermoto) in April here.
So far so good, easy installation and no operational noise .-)
I was using cappellini sprockets after destroying two original tensioner, it lasted for one season before the upper sprocket rivet started to move around, afterward I changed the rivet with a small stud and some welding, but I was not that happy with the fluency of the result. I did another season - last year- that ended up with a broken camchain, maybe because of my fix, I will never know, the chain also had 2 and half season.
I like Mirko's tensioner because it supports the chain in its entire length, also it feels VERY solid! With my mechanic we were joking calling it an "antiseismic" tensioner. So far highly recommended :-)