so the part that connects to the handle bars is the RAM EZ-Strap? and then the part that holds the phone is the Universal X-Grip?
I watched the video on the RAM EZ-Strap and it looks awesome. I like that I can put it on and take it off easily.
The Universal X-Grip makes me a little nervous. I do love the fact that it doesn't cover the camera (so maybe I can use my Icon as a video recorder during mountain biking. It's just that I go over some pretty rough terrain and bumps and jumps. They showed a vibration video but that's more akin to riding down a street or on a motorcycle than mountain biking. I like how I can easily switch between my 521 and Icon as well.
I think the RAM mount above would be more stable but it covers the back and I don't think it's compatible with the RAM EZ-Strap. And it's not as quick for switching between phones.
EDIT:
after reading more reviews on the EZ Strap, I'm not going to get it. Yes, it seems super convenient but it seems to slip a lot which I know can be very annoying (one of my headlights on my bike kept slipping due to a poor mount).
I'm going to go with this (RAM Handlebar Rail Mount with Zinc Coated U-Bolt Base and Universal X-Grip? Cell / iPhone Holder Product Number: RAM-B-149Z-UN7U):
It's kind of ugly and bulky. But the Amazon reviewers don't mention slippage as much as with the EZ Strap. It's more expensive though. I'll let you guys know how it works. I'm mainly getting this for my GPS routing. However, if it's as good as it seems, I might actually try making some videos (Go-Pro style) with my Icon. Let's see how the Icon video recording is in an action setting...