I don't get the whole obsession with thick keys. I can step (using my heel) on one of these keys with all of my "impressive" 220lb mass, and nothing happens. It isn't like the sound difference is significant, nor is there any significant difference in wear qualities. We are talking about MX Red Alert, there is already a Topre GB in the works. Doubleshot doesn't work with PBT, it doesn't flow as nice I think and its more expensive.
The only reason to use PBT to begin with is because it is porous and can be sublimated. Its only a coincidence that people like the feeling of PBT and it gets used in engraved sets.
Anyways, the keys in this set will be here soon, and I've gotten several PMs of people interested in the last few 104 sets I have, so expect them to be out of stock and the market price to go up beyond what mine are selling at once the keys ship out. If you want one get it now.