Installed the Protege 9.0 wireless bike computer‏ the other day, took me about an hour or so just taking my time as I had to program the computer and set it up on the bike. Wanted to try to install it myself instead of just taking it to the LBS. I couldn't get the magnet to read with the sensory, as I tried to align it with the way they recommended. Finally I got it to work as I positioned the magnet right above the sensor unit (not directly parallel as the recommended). I don't have a GPS for my bike or an iPhone with an app currently. For $34, I thought I'd grab it for the interim period. Was looking forward to testing it out today but got rained out, maybe I'll put it to the test next week.