Any of you guys own one of these beasts? I used to go with Sigma Sport cycle computers because of their reliability and accuracy. However, the bike shops around here no longer stock them. So I got this Echo-F7 unit. It's easier to install than the Sigmas. And as accurate. However, today when going for a ride it noticed that it was reading fast. When I checked it appeared to be reading twice as fast. I checked the wheel size calibration. All is OK (1845mm circumference). I was wondering if anyone who may own or have owned one of these had any problems? Ta.