Not particularly a fan of most things Ducky, but those red rests look cool. I don't know how functional they are.
I have the "leather" one for tenkeyless. Don't know if it turely is leather, but it feels fine. They are actually hard, not soft. They even have a metal plate inside. I thought this was bad at first, but then I grew to prefer it over my gel rest because:
1) it doesn't bubble and push into the soft area of my wrists the way that the gel does.
2) It is the perfect height for my 1087.
I doubt it is for everyone, but it is an option. I would compare it to the wooden rests that people build, except a little softer, because there is a thin layer of foam under that "leather."