I was on the fence for quite a while in upgrading my Series 0. The microphone gave out on my Apple Watch and I decided to look into an upgrade. Though I was not convinced I would notice enough difference in either battery nor performance to warrant the cost. Boy! Was I wrong! The difference is night and day. I find myself using my Apple Watch way more than ever before and for everything I initially intended to use it for. If you were one of the early adopters like myself and are hesitant to upgrade, I would consider taking the plunge. It may just change your opinion on wearable technology all together.