The GPS was acting up, so I initialized it and used it. I think it worked normally right after initialization. I mainly used it for races, and I don't recall the distance being significantly off. There's a film on the screen, so the screen itself appears to be scratch-free. The film has scratches. Please check the images. I rarely looked at heart rate, so I'm unsure about that. I used it in stamina mode or similar for races over 100km. The button feel is normal, I think. Since the color is white, there are some stains. It will be shipped as is. I have not tested the detailed functions.