I love the features I've explored on this watch, my favorite being the stress level feature. I love that it can track my heartrate, however I'm not 100% sure of accuracy as I have not compared it to a different medical device, that I know is reliable. What I hugely dislike about this product is the strap, and how uncomfortable the silicone is against my skin, but if you search for "GTS7 watch bands" online, you're able to find replacement bands. The watch is great, but I wish it came with a fabric/nylon band.