just got one today, for my new Giant defy Advanced Composite 2. wow. only $150 ($50 more than a Cateye Wireless) and no magnets, no tire/wheel size to fiddle with. comes with 2 mounts, and it will switch between 2 bike data sets. everything a nice Cateye gives you plus it saves rides, gives you elevation gained, and (roughly) computes calories burned. more later in another thread on the Defy (its a 2011).