I bought a couple to replace the gaps in my rack and really like the color-coding. They're also prettier, I almost hated to place and scratch them. Okay not really. Like the guy above, stoppers are the foundation of a rack. I will trust one before I will trust any other pro. Make sure you have the full set, and the price is right on these.
Cheaper to buy the draw than the biners individually. Good BD wiregate biners and a basic draw. Hard to go wrong!