Bought the ithlete and accompanying chest strap and wireless receiver for a total of $85. I had high expectations based off the cost as well as the generally positive (though few in number) reviews on the App Store. Overall I have not been satisfied in the investment. The chest strap gives inconsistent readings at best, and often doesnt pick up a pulse at all. I still do not get consistent pulse or HRV readings, even after troubleshooting and contacting customer service and following their advice. If you really want to monitor HRV, you will have to invest more in a more established brand - ultimately, you get what you pay for, in this case wasted $85. I am currently seeking a refund.