I have the Suunto T4C. I have some problems with the comfort strap dropping my heart rate but it seems to be due to the size of the "one size fits all" strap. With Polar I was able to get an XS and it fit great. The readings are great when riding my bike but if I do any activity where I'm moving my upper body or my arm my heart rate consistently gets dropped. When I wear the strap under a bra with a wide band and tight fit the readings are much better. I quit using cream and only use water on my skin and the strap and it works perfectly.
I love the ease that information downloads to the computer and once I figured it out my bicycle pod works well, too. Changing batteries in the watch and strap are very easy. I'm hoping they come out with a smaller strap soon.