So far so GREAT! Heart rate is awesome and I love how I can choose whether or not to have it beep. The comfort strap is just that, comfortable! I forget it's on quite often and then look down at my watch to check the time and realize that it's my heart rate!
The compass works great but I definitely need to remember to recalibrate before using it on a trip. I also LOVE to see my elevation at any time as well as the temperature which I use a LOT. You definitely need to remember that your body temperature manipulates the outdoor temp so I just take it off for about 5 minutes to have it regulate to the temp outside. I cannot wait to use that feature on a long camping or hiking trip!