Anyone using Oregon Scientific Vibra HRM?



I posted a question about Polar HRMs with SonicLink, and appreciate the
feedback. In my search for HRMs, I've come across the Oregon Scientific
Vibra model, which is currently on sale at Nashbar. The key selling point on
this one would be it's vibration mode, which means I could use my iPod and
still get heart rate feedback, because it vibrates instead of beeps. How do
these compare to the Polar models?