I just threw one in the trash, I forgot who made it, something starting with a "V". I went to the LBS and grabbed the first, cheepest, wireless model I saw, $30 and some change. Problem with it is; it goes into "sleep mode" if idle for 5 minutes, and does not have the sense to turn itself on when you start moving. It must be "awoken" by pressing a button, you have to pay attention to it, or you never have accurate trip time, etc, even the odometer does not work in "sleep mode".
Bought the first cheepest Cateye, works great.

--A