Since I can't use a strapped version, I was using a strapless one for awhile, and I really liked it. It gave very accurate readings. You put your thumb and forefinger on the oval's and in about five seconds it gives you your HR.
I used it while riding my bike, but only inside since it was very akward to try and get a HR whilst riding on the roads. I checked mine one minute into my ride then at five minute intervals, and at the conclusion. When I got upstairs, I entered all the numbers in and got an average for the ride.
I need to get a new battery for, so I haven't used it in awhile.
Given the option I would use the strapped version, but because I have an AICD, I can't use it because of the interference.
It ran me about $80.00 and that was two years ago.
Impulse Heart Monitor