These joysticks are junk. I bought two a few months back and my wife had broken one within 5 minutes of playing Burger Time with it. They don't 'feel' like the real thing either, the stick seems to have even less actuation angle than the originals.
Moving the joystick causes the plastic circular retainer that holds the sticks rubber to be put under pressure, after a while it just snaps off. The original Atari sticks didn't use any kind of retainer and were much more robust.
That said, I guess they are worth the $5 you pay. Just be aware that they'll fall apart much easier.