Class 3 form finally came in this week. I like the simplicity of the mounting design, but it is a pain in the ass to pull up that release tab after a few rounds. If you get on do NOT use anything heavier than Rem Oil or it creates a hydrostatic seal and you will have a real bitch of a time removing the can. I also just got the 3X Eotech magnifier, they are VERY cool. The only thing I don't like is the complexity of the adjusting system and that it didn't come with a thumb screw to mount the whole setup to the rail. Other than that, it was a great idea and fulfilled need.