I purchased a Wilcox Aimpoint mount from TNVC. The Wilcox mount is smaller, lighter, and slightly taller then the stock Aimpoint PRO mount(shown below).
The Wilcox Aimpoint mount is similar to the PRI mounts, but it is skeletonized reducing weight.
Installing the optic in the mount was pretty easy. The battery cover had to be removed, and the top and the bottom of the mount are attached by 4 Allen head screws.
One thing I really like about the Wilcox mount is that while it is the highest Aimpoint mount I have used, you can still easilly use your iron sights in the lower third of the optic. I find the Colt 901 sights have a nice lower 1/3 co-witness. (Pictured is a friend of mine firing the 901 with an Aimpoint PRO in Wilcox mount.)
The Wilcox Aimpoint mount is a good solid piece of kit popularized by its used on the MK18MOD0. However for most of us, it would not be a significant improvement over the stock Aimpoint mounts. Personally, if you have the stock Aimpoint mount with a torque limiting knob, I think it is not worth spending the extra money on the Wilcox mount. If you are going to spend money on an Aimpoint mount, I would recommend spending a little more and getting a Larue quick detach mount.