Things I liked: Very stable once you figure out how to make it work. Holds my 3x9x40 Leapers perfectly and seems to be rock solid. The grooves fit my .25 cal Webley Patriot perfectly and so far it hasn't moved a bit.
Things I would have changed: Put some instructions in the box for simple minded fellows like me ;0)
What others should know: Doesn't come with any instructions. You are own your own when figuring this thing out but it really doesn't take a rocket scientist. Works really well once mounted. Make sure to have some loc-tite handy.