I have been an ithlete user for a little over a week now and each day I am a little more amazed at its accuracy based on what I already know about myself. For example, last Friday I had two speed workouts along with yoga, weightlifting, and a long walk. The next morning, ithlete showed I needed to take it easy. Fortunately, by Sunday ithlete said I was good to go for my long run and I was able to do my first 20 mile training run for an upcoming marathon. The only consumer device I know that provides this sort of information is a Polar RS800 for around $350 and ithlete is much easier - 1 minute every morning. In the past, if I wanted to know if HR was responding to training, I did a 5 minute Fit Test on a treadmill or every few weeks ran 5 miles at a steady pace. I think I can get the same information from ithlete just from putting on a strap first thing in the morning.
BTW, I am not new at this. I am a 69 year old runner and geek who has been running most of my adult life and have tried just about every fitness gadget that has come down the pike. I think ithlete is going to be really useful and I wish it had been available a long time ago.
Billcoff about ithlete Train.Recover.Perform