Only had mine on since Monday, and only covered about 100 miles, so far so good. I really wanted a zorst that wasn't too loud, yeah, I know, it's an age thing and this suits the bill down to a tee. No droning, no vibration and no fuss. Give it beans though and it sounds great, the closest thing i've heard to it is Ebizeds' Stillen on his 370, the best way I can describe it is rich and dark, hope that makes sense!!?