-cheap
-easy to find (Blade)
-works
-easily concealed
Weaknesses:
-If you wanted a large capacity hopper, you would've bought something else
-Transparent-ness
Review:
Well, I got this on an eBay Blade, and I must say, for something this common and cheap, it works like a charm. Of course, just like any other mechanical feed hopper, but it works. You'd probably want to spray on a fade camo job, or make it flat black, but only for the camo reasons. Not really much other stuff to say.