I think this is a really great mount for a Garmin 810. I've used the non-XL version which also work fine. The increased length of the arm on this version makes it easier to mount the computer without interfering with other bar mounted items such as cube lights. Being a little bit longer also helps make the computer screen a bit more visible at a glance.
Very strong durable mount much better than the predominantly plastic mounts. Only drawback is it's a little heavier, however I'll take a few extra grams to insure the reliability of this mount over the chance of my Garmin hitting the ground.
Worth it. Stock edge mount doesn't permit charging while riding because it causes the handlebar to block the usb1 charging port, so you're out of luck using edge 1000 on stp because it runs out of juice by Longview. This holds the edge out far enough to connect a usb1 and power Birk to the edge 1000 while you ride and finish long rides.
The early K-Edge mounts were a bit more complex than I liked, there were two bolts to clamp the mount to the bars, and a third to adjust the distance from the handlebar. Plus, the case of the GPS was in direct contact with the aluminum mount, possibly leading to premature wear.
The new version, with its one-bolt hinged mount, is much simpler to install, and the removeable plastic insert is nicer to your GPS. These mounts are flex-free when installed, unlike some of the plastic mounts on the market (I recently broke a plastic mount while moving it from one bike to another). I'll be switching to the K-Edge on all my bikes.
This is the second K-Edge mount I have purchased for my Garmin. (Two separate bikes) It mounts easily and securely to the handlebar, puts your Garmin in just the right position for easy reading, and also hold your Garmin very securely. So much better than the original Garmin mounts!