I've used one since I got the Ultra Classic. It's a great device that everyone should use. The only downside is if you run a sport windshield on the bike it won't fit. I use to hold my garage door opener, sunglasses, iPod, and other small items like chap stick and eye drops.
My only complaint is that as it's aged, the leather stitching on the outside of the bags is kind of turning a purple color.
or some kiwi shoe polish , cleans up leather nicelyTry putting some leather conditioner on them and see if that helps.