I have been upgrading my trad rack, and I found these to be the perfect 'biner for racking my gear. They are lighter and smaller than full size, yet big enough that you don't have any issues clipping the rope. The color spread lets me use them to color match all my cams to the BD/DMM color scheme, so I keep everything in the same size range on the same color 'biners. With the additional colors, you can then mix in colors for anything else you want to rack.
I think the Metolius FS is too small (as would the Edilrid 19 be) for me when climbing, but these give me just a bit more space through the gate. I also have some draws with these on the hanger end, and they work well, again lighter and smaller than the full size units, but large enough to make clipping easy.
This review was written in the old system and had content requirements that are different than reviews written today.