It's nicely machined and locks into forward position, looks neat, covers your cocking knob slot, offers easier recocking for lefties, available in many colors, seems very sturdy, made of metal. Customer service is good.
Doesn't fit with the Flatline shroud!
May not fit with any of the CAR stocks!
The screws that come with it are need a totally different size of allen key than any other part.
It's kind of bulky on the side of the marker.
I may take it off and go back to side cocking because of the way it doesn't accomodate my Flatline shroud.
If you don't use a Flatline, you really like the looks, or you hit yourself with the stock cocking knob, then buy it. Otherwise you may want to save your money, this is largely cosmetic (though very nice).