The Speed Feed Halo and Vlocity Hoppers lids really helps you load faster without looking and they actually keep the paintballs secure in your hopper.  The Speed Feed is a one way feed gate, that allows paintballs to fall into the hopper and not bounce out.  It installs like any replacement lid, and snaps securely in place.  This is great for any tournament player.  The down site is, it does not keep the weather out.  So if its raining, or sprinkling, you might want to put your stock lid on, unless you are really blowing through paint.