Nice upgrade from Series 1
I just upgraded from the Series 1 which is also a great watch. I upgraded because I wanted the cellular capability, needed a built-in GPS, and also wanted it to be capable of going into a swimming pool. I do lots of bike riding and having a large, heavy iPhone in my jersey pocket is not desirable. I have been testing it's capabilities without being in range of my phone and it works perfectly as advertised. I have been able to make and receive calls, texts, and emails without having to carry my
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phone on a long bike ride. My wife can also keep track of where I am using find my friends. I can use Strava to track my ride using the built in GPS. The Apple Music streaming that was just introduced with watch OS 4.1 is the icing on the cake. Keep in mind if you are using the GPS, music streaming, and making any phone calls while away from your phone, the battery life will be short. I typically use a GPS cycling computer on rides to keep from running my watch battery down as quickly. Overall a great product that works well and has been a great upgrade from my Series 1. The upgraded processor of this watch is noticeably faster as well.