I used the cs200cad for 3 years with good luck. When the cadence and speed sensor batteries died, I made the switch to the Garmin 305 instead of buying new sensors. Main reasons I switched was for the altitude capability of the Garmin, GPS route tracking, and the fact the Garmin SW works on my MAC. The CS200 computer worked well with no issues but did not care for the Polar SW.
Looking to replace my cs200cad after finding out that when the batteries on sensors go, you have to replace the whole sensor. My bad for not checking first, but never considered the possibility of not being able to replace the batteries. Currently looking at the Sigma Rox 8.0 or 9.0. I would suggest checking that out before pulling the trigger on the polar.
Also, I've read alot about calorie consumption not being to accurate if you aren't getting them from a power meter.....don't know much about that, just what I have read.