I have the Forerunner 305 with the chest strap HRM and cadence sensor. I love it, and have been using some form of the Garmin GPS watches for years. That said, since you're most interested in calories burned, here are some things that you might consider...
For the calories, so far as Garmin told me, they use distance, speed, elevation. Before I added the cadence sensor (and when I'm using my carbon bike which doesn't have a sensor mounted), the calories I get while biking/running outside are very consistent, and consistent with what you find here on Sparkpeople and on other websites.
However, when using the watch with the cadence sensor, the calories go way up, and I don't think it is realistic (hey, I'd like it to be true, but I don't think it is). I emailed the Garmin folks, and they insist that the calories with the cadence sensor will be very accurate, but I'm not convinced.
One very important issue is that, according to what Garmin told me, they don't use the HRM to calculate calories. So, I don't believe that you can get calories burned if you aren't outside/moving as it relies on GPS and you can't get GPS inside, obviously. I haven't tried it inside lately, so maybe this has changed, but if it hasn't and if the Polar works inside, unless you want to know how far/fast you are going in addition to calories burned, you might want to consider sticking with your Polar.
Edited by: RESIPSA99 at: 2/15/2010 (13:10)
| Pounds lost: 7.0