The name Wallnuts reminds me of a drinking game in college where you face a wall while holding a ping pong ball above your head. Upon dropping said ball you attempt to pin it to the wall with your forehead. If you miss you drink. Ah, good times.
DMM's Wallnuts are a considerably smarter investment, especially by the set. Every rack needs some good old-fashioned passive pro, and every climber should know how to place nuts and hexes. The Wallnuts are lightweight, inexpensive and work like champs. They have a concave taper on the sides and the front is convex with a little trough running top to bottom. This complex (for a nut) shape makes the Wallnuts work better than anything else in irregular slots.
The color coded heads make it easier to grab the right size with a little experience, and anything that helps with efficiency of placement on the sharp end is allright by me. At under a Benjamin for a full set #1 to 10 you just can't go wrong. As with all nuts, make sure you have a nut tool to extract after loading.