I bought these magazines about three months ago and they have worked decent. They fit a little loose, but they won't fall out of the gun (JG T3). This is due to the tab on the top of the magazines not being square, so the tabs don't actually lock in the slot that they're supposed to rock into. However, the mag catch holds them in so well that I can hold and shake the gun while holding the magazine, so I have no fear of them falling out of the gun. They also have very visible seam lines, but the magazines are solid and actually have a decent amount of heft to them. I have not had any feeding issues with them and they are very good for the price of the bundle.
Won't fall out of the gun
Easy to maintain
Wobble can be a nuisance
The seams make it look weaker than it is
Rating: [4 of 5 Stars!]