I bought this because I was tired of making endless trips to the watch repair guy for all of my batteries. I own a lot of watches and always seem to need a battery in at least one of them. While this tool did open my watches, it is awkward to hold, the spinner always seems to go in the wrong direction (no labels, both sides are identical visually) and the little grabbers/prongs have quite a bit of wiggle room. For the price, I can't expect more, but a more professional tool would be good if you plan to use it a lot.