Yeah I just bought a set of these a couple days ago and they are being delivered tomorrow, worth the extra $1 I think. -edit, I they were actually delivered today, the shipping was pretty fast. I like the rubber texture on them. The only real downside I can think of is that the number keys don't have the secondary symbols on them, but I'm sure that's because of the nature of the textures on these it would be difficult to do. They have been expanding the number of keys on these sets over time, I think the next step should be to make these for a full 60% keyboard.
PS the purple color is pretty swagtastic.