I purchased this hopper mostly for looks and for the fact that it sat much lower than the VL in my gun(only about and inch and a half). The design looks stunning, it is one of the sleekest hoppers I have seen. I've read in other reviews that o-rings are expensive, but the one I purchased included a small bag of extra o-rings, so that was not an issue. Of course for a gravity fed hopper $10 seems a bit steep, but hey I like so I buy. The hatch is very secure. I have fallen once with this hopper on my gun and not a single ball lost, very happy. The main reason jamming has occured (i think) is because I live in Louisiana. Which basically amounts to humidity abouve 90% every day, and the paint may get kinda moist and stick to each other, but a little shaking isnt that bad once and a while. I have also read that the RICOCHET effect does not occur for many people. Well I 've had a least two to three hopper hits and the balls did skip right off, but if the hopper is hit squarely, i.e., on the side from the side or front there will be no ricocheting. Which no amount of odd geometry will fix because when ball makes contact will sharp of flat surface its gonna break.
If your not a fast shooter then this hopper is fine. It does save you sometimes, but hey thats life for ya. If it werent for the price I would give this a nine, but hey im cheap and ten bucks for a peice of lexan like plastic is rather pricey. Only buy if you would like a shorter profile and increased looks, and maybe a save from hits.