Its neat how we all have different needs. I am sort of a data junkie and use the CATEYE commuter on all of my bikes. Purchased an extra magnet sender unit for the Curve SL and swap it as needed. If I really need more data I use my Nokia N97 and the SportsTracker application.

My purchase reasons were very superficial. As I loved the layout of the CATEYE commuter. Agreed on the carbon offset being gimmicky. The backlight on the device is a joke and doesn't stay on long enough. I knew about this before hand.

Interference has never been an issue, even with my phone positioned right next to the comp.