It is good to see people using HR for training recovery. I combine HR and individual recovery time between sets to help clients training to have less wasted time in their workouts. Being able to repeat a set properly and knowing when they have reached their limit on any given day is greatly enhanced with hard data like HR and VMA comparison. And HR monitoring between workouts will help to guide training frequency. I personally prefer Polar products as I have had great success with these. They last a very long time. Good written tracking (or on an iPad, etc.) and comparison of previous sessions are very useful in program progression/regression.