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Same here, loved the idea since I was a kid and I spend a lot more money on gadgets than I probably should but somehow managed to avoid getting a smartwatch because it doesn’t do anything a smartphone does better. I just wear a simple casio solar powered watch I got for about $100 which I never have to charge. I still like the idea of something programmable though, but this watch in OP is a bit too DIY for my tastes.

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Smart watches, in general, have a better GPS antenna. I tried running using just my phone's GPS and it's all over the place, completely unusable for that task (it showed me crossing walls, canals, running in circles where I went in a straight line etc.)

Also, a lot of smart watches come with a pulseox, so, you can look up your pulse any time you like :D Not super useful unless you are working out, but there's that.

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