I use a Mio link with a Garmin Forerunner 50 watch as well as various iPhone apps. Not the same as a cycling computer, but it works great. No glitches that I can tell, but I don't download any data so I can't see it graphically. I just look at instant readout in real time and the full ride average at the end. Folks tell me that the wrist sensor does not supply the more complete heart function data that a chest strap does, just simple pulse rate, but that is all I am looking for anyway. I never could get a chest sensor to detect my heart rate until I had worked up a good sweat, but the wrist sensor is instant on. Sweet.

Mio is compatible via Ant+ or Bluetooth with lots of Garmin devices.