The one thing that bothers me with ANT is that it's supposed to be an "open" protocol, but in reality it's this proprietary thing that Garmin has locked down. In my experience, there are a lot of hoops to jump through just to get a basic app set up (all of their example code appears to be ~5 years old).

It makes me wish there were an open, real-time, fitness data project that had more easily usable SDKs for these kinds of things (along the same lines as Golden Cheetah).