The Garmin 205 is great. It's way better than any other cyclocomputer I've used, and I've been riding for 10+ years. No magnets needed, no calibration. Move it from bike to bike in 2 seconds and go. I own 4 different bikes, and this one Garmin unit goes on them all. You can even use it for running. Just stick it in a pouch or MP3 player armband thingy and go. Once you've downloaded the info into your computer after the run, just drag and drop the info into the running folder in the Garmin training center and you are done. You can track every mile by the day, week, month, or year. This thing really helps you keep track of your training. It's really cool and well worth the money.