So I have a Series 0 that works great. Bought a knock off volt green band and I was pretty satisfied. However I keep looking on iStock and then all of a sudden a series 2 nike with the black and volt band popped up at an Apple Store down the street from my work. I impulse bought it and have been using it for a couple days. For me and what I use the watch for I think the series 0 might be good enough. Here is a list What I use it for - I charge in the morning while showering and then around 8pm when getting ready for bed. Never ran out of juice - Notifications - Sleep Monitoring - Silent Alarm - I go to Crossfit every morning and wake up at 415am, dont want to wake up the better half or the kids - Use Under Armour to record crossfit workouts and running 3 times a week - Filling the rings everyday - I dont use alot of apps so speed of software is not really needed or noted much What I like about the Nike - Battery is nice not having to charge it. - GPS is cool, but I bring my phone with on runs so not really needed - Waterproof- I dont so much swim as I do float. I take my watch off anyways when I shower - I love the band, it feels a little different than my knock off and the color is brighter. - Nike Watch faces with matching colors is another cool thing SO bottom line, I threw my series 0 on craigslist for 200 with everything and about 8 bands. I would probably take 180 have had a few bites. Will try for a couple more days then if it doesnt sell I will return the Nike one. just thought I would throw this out there for anyone thinking of upgrading. I am usually a gadget geek that wants the latest and greatest. But in this case, I am not sold that its that great of an upgrade.