I'm not sure I'd like a phone as I like to have the garmin on the top tube, so I can see the distance travelled when following a route sheet. Also like to have the temp, time, current speed, average speed, elapsed time and compass heading scrolling through whilst I ride. I've never had a problem with battery life on a 200 and I've used it on a 400 calendar by charging when I stop, but it is another layer of faff and becomes more crucial on a DIY, whereas on a calendar it doesn't matter if it goes tits up. If I charge whilst riding it means I have to mount the unit sideways to get the lead in and have a little top tube bag for the charger. It works fine if you start the track after plugging in, but it is a sub-optimal solution.