Once I put new batteries in the sensors and stopped carrying my cell phone in a bento box near it, my Polar has worked flawlessly.

The Ciclosport 434 does everything but HR and calories, and doesn't download an elevation profile. The cool thing about it is you can get total climbing for the day as well as see the percent gradient of your climb while you are riding. Jobob has the downloadable version. I really like mine. Very trustworthy, easy to read and use. A cadence meter can be added to the basic unit.