I have one and I like it a lot. Very comfortable on my upper arm and the accuracy is good enough. I have found it gets flaky when it's really hot and I'm sweating a lot. I haven't done any real long rides with it yet, only as long as maybe 5-6 hours, but the battery has held up fine. I recharge after every ride. It works well with my Wahoo Elemnt and also at a spin studio I go to when the weather is bad. I find the data helpful to know whether I'm overdoing it.