Bests & Worsts Reviews from Amazon

For some reason these controllers from Amazon just aren't the same as the ones from wal-mart. They're lighter, the analog sticks are so loose, no stiffness at all, they just flop around, and they all die on me within a few months. There must be different manufacturers involved here. EDIT; By die I mean they quit holding a charge for more than like 30 minutes. I have a wal-mart one that I bought when my PS4 that is a year and a half old and it's analog sticks are still nice and stiff, it still holds a 5+ hour charge, meanwhile I've gone through four of these and have no intention of ever buying another one.