The MotoACTV is 5x more functional and is way better-- the iOS nano with Lunatik band is the best on battery but leaves out most of the MotoACTV's functions. I use the MotoACTV for working out and running and the Nano for normal day-to-day. The i'mwatch has been unable to pair to any of my 6+ phones and REQUIRES bluetooth for connectivity... I work in IT in the US and have had zero luck connecting with mine or any of my friends phone. This thing is the biggest disappointment to date with a smart...
Some of you may remember when the 6th-gen iPod nano came out a few years ago and I immediately dismissed suggestions of people wanting to use it as a watch. "No!" I said (see: http://gdgt.com/discuss/to-anyone-even-thinking-of-using-this-as-a-watch-a8c/)
However, I just discovered this beautiful thing and I want it. Badly.
So, I apologize for being so dismissive of the nano-watch. Because, this concept probably can be pretty cool.