Being water proof and having a cellular connection are great features. I like swimming and nothing else on the market does swim tracking as well.

I can go for a run, a swim, buy lunch, and take an Uber home all without my phone.

I bought the Series 1 and stopped using it because it drained the battery on my phone, especially if I was using something like Uber that needed to continuously communicate to the watch. Would love to read reviews on the battery life of the watch.