I like mine, having fibro some days I wasn't upto the 10,000 standard steps, so I lowered the target while I got fitter and could cope with walking more.
the heart rate feature was a real surprise! when I'm driving mine goes up by over 30! but after a nasty car accident when my car was flipped by a speeding driver I guess the PTSD kicks in now and then! so now I try and relax more in the car, i do check it, and if the heart rate is climbing i make an effort to listen to more relaxing music, press the button to go to cd instead of the radio. I also try to avoid the busy rush hour, its has helped me to make a concerted effort to reduce the stress in my life. mine was worth every penny.