I'd love to hear the pros and cons and people's experience mounting an iPhone on the handlebars. Also, if there's a particular mount you'd recommend (or avoid) love to hear that as well. While I hope to get a Garmin 510 one day, for now I'm happy using the Cyclometer app on my phone - but I think I'd like to see the screen as I ride. Right now, I keep the phone in my jersey pocket.