I've not used a HR monitor since I left my chest strap in a pub many years ago, but I think the thing I miss the most was the "beats per mile" metric on fetcheveryone.com. It showed a pretty useful correlation between my hear rate efficiency at various paces, and my race times. And if you were trying to monitor improvements in fitness it prevented you being tempted to increase the pace of your easy runs whilst trying to kid yourself you weren't working any harder.
I've not used a HR monitor since I left my chest strap in a pub many years ago, but I think the thing I miss the most was the "beats per mile" metric on fetcheveryone.com. It showed a pretty useful correlation between my hear rate efficiency at various paces, and my race times. And if you were trying to monitor improvements in fitness it prevented you being tempted to increase the pace of your easy runs whilst trying to kid yourself you weren't working any harder.
Foot after last night's 6.5 mile run: all good.