I love my polar heart rate monitor. I find it really motivating in so many ways. It lets my gauge how hard my workouts are and I know when I need to kick things up a notch. It's also nice to see things that used to send my heart rate through the roof can barely get it up to 80% of my max now. It also gives me an idea of how many calories I burn/week (I set a weekly goal) and how many hours I've worked out.
I just got mine but I love it. Just like rockstar it makes me push myself. For example I did Jillian's Frontside dvd but because she spends a lot of time talking and cueing you are waiting for the person to finish so the first time I only burned 215 calories. The next time I decided to exercise during the first set to learn the exercise and just move without stopping the additional 2 sets. It made a difference. I burned 91 more calories. Once I really learn the dvd I will burn more. I wouldn't have known that without my HRM.
That is what I love about this watch. It really is a great motivation. I find the investment was well worth it I am trying to get my o2 level up because I am at 32 :/
Sometimes I do not believe my eyes after I work out when I see the number of calories burned and what my heart rate got up to.
I absolutely love mine. I usually get my running done on the treadmills at the gym and there I don't even have to wear the watch. Military gym, all of the treadmills, stairsteppers, ellipticals and bikes are made by LifeFitness, which is Polar heart-rate ready. My heart rate is constantly displayed without my groping for hand sensors.
If it's a nice day (rare here where I live in the usually frozen tundra), I'll wear the watch and run outside. Either way, it's been a boon for me.
I love my HRM's. I have a Polar F4 for general workouts and a Garmin Forerunner 305 with a cadence thingy for biking. They push me a little bit harder and also inspire me. They're a great motivation to workout because both track my workouts online and I love seeing my progression, my stats and I'm a graph junky!
I'd credit both with turning my weight loss journey into a health journey. I started off just trying to get skinny and now, since getting into exercise I want to be totally fit. I wasn't so interested in exercise before getting them as I didn't have a nice way to track it.
Absolutely LOVE mine also. I use if for all the same reasons the gals mentioned above. It's been an invaluable tool for me when it comes to motivating me. My only regret is that I could have saved some $ and bought a cheaper model. I haven't ended up using the personal trainer programs on the F11 I bought. So the F6 would have been perfect...and smaller!
Polar heart rate monitor.
I am trying to get my o2 level up because I am at 32 :/ 
