I"ve used the RAM mount, and found it quite robust. But I didn't like that it wasn't waterproof.
So I switched to the Lifeproof iPhone Case
. Fully waterproof, and doesn't add much bulk to the phone so I leave the case on all the time.
I started with the Bike & Bar Mount
but couldn't find an easy way to mount it to the motorcycle. So I swapped for their GoPro Mount
which was much easier to bolt in place. The Bike & Bar Mount now lives on my bicycle, where I can use bicycle-specific tracking and GPS programs.
It's easy to snap the iPhone into the mount and lock it securely in place. Then I can pop it out and take it with me when I leave the bike.
The headphone port is accessible in the mount (and they make a waterproof headphone adapter cable), but I leave it closed off since I'm using Bluetooth to interact with the iPhone.
There is a bottom door to get to the Dock Connector for synching/charging, but you can't open the door while using the mount. I modified my mount so I can open the bottom door while the iPhone is mounted, as I often ride 24 hours or more. For most riders, the standard iPhone battery life should be more than sufficient for a full day's ride.
I've done a lot of research here and chased this all down, and LifeProof is easily the most robust and convenient solution.