Originally Posted by
Wattsup
More toys and graphs are ALWAYS better. I own a pair of Assioma, but I only use them indoors. I use flats on outdoor rides, using heart rate to gauge effort. Guess what. Heart rate sucks at accurately judging effort. I say buy the new toys.
I on the contrary, find HR is pretty good at predicting what pace I can sustain at that particular day. A PM tells you what ever power you deliver (unrelated to HR), but it doesn't know if you are catching a cold, if you are about to bunk ect. Both have their merits.