My Band 1 died one day after about 4 months. I put it to charge overnight, took it off the charger in the morning, looked at the screen to verify that all was well. It then went dark and never came back properly. Best I could get was horizontal lines. I took it to a Microsoft store a month or two later and they replaced it free (though they only had a medium and mine was a large.) They wouldn't let me upgrade to the Band 2 unfortunately... So far the new one works ok. I'll probably keep it but I wish MSFT made a decent watch-like version. Next chance I get I will try the Vector Smartwatch - at least that's waterproof.