I have one on my Model 1100 Magnum. I have shot some clays and waterfowl with it. It works as advertised, and mounts painlessly. Well made.
Years ago I had (still have it) a Weaver Qwik-Point. I had endless mount issues, it was naturally lit, it fogged up at the drop of a hat, it was big bulky and heavy. But when things were right it was the greatest aid to long range wingshooting ever. Of course shooting at stationary targets is a snap too. The red dot is out there in the same focal plane as the target, so your eye can easily see both without taking your eye off the target. I do wish the bead was a little bigger and brighter for wingshooting, but it still works.
What could have happened... did.