hmmm.... interesting response from the 50+ forum.
I already have this setup. iPhone/SMHeartlink/GSC10/HRM. all talking together and even uploads to the web when I am done with the ride. Guess I _am_ a geek.
iPhone seems to run forever. Since the new Digifit device came out it really is surprising how long it runs. did a 62 mile ride not long ago with it and had hours of phone battery left. YMMV.
http://www.digifit.me/