Mine arrived yesterday.
It is very cool and I am very happy with it so far !!
I haven't shot with it, but I did do an intial setup with my laser boresight. I had the big green dot (Viridian) chasing the little red dot (boresight), until they merged. Then the red dot couldn't be seen anymore, because the green dot is so much brighter.
It is fairly difficult to get the unit off the rail, but that may improve as time goes on. I don't intend to remove it very often.
The standard release button to get it off the rail sticks out of the left side about 1/8" and less on the other side. But, it comes with an alternate release gizmo which is flush with the housing so that it won't catch on a holster.