That is an encouraging battery life report.
Has anyone used the devices that connect an iPhone (or Android phone) to a cadence sensor or heart rate monitor? By Wahoo, etc?
I have the Wahoo iPhone case that has the integrated ANT+ dongle -- it has been perfect for me using a Garmin GSC-10 for the cadence/wheel speed, and a Garmin HRM strap. The Wahoo cadence/speed sensor looks pretty good too IMHO.
I started using Cyclemeter with just the built-in GPS, and really liked it. I just put it in my seat bag (I always carry it) and used the data after I got home.
Then I bought an Edge 500 for my bike, and use the Cyclemeter app as a backup. I figure I always bring the phone so I might as well put it to use while it is in my seat bag.
Hope that helps...
-Tom in SoCal