I have taken my Overdrive out 6 more times since my last post (I'd done one ride with it at the time) and done about 35 miles or so total of some pretty aggressive stuff (went through about half of the "Expert" trail yesterday, about 5 miles worth over about an hour). The worst thing so far is the back brake has been squeeling, but it may just all need a good washing. But, everything is holding up great, the wheels are still completely true, and the rear shifter (the only one I use) is still working perfectly. Granted, not a lot of distance, but it has definitely seen way more than average stresses for this distance (at least 100 shifts yesterday, for example, in that 12 miles).