I have not used the blanks, but they looked good. I chose to make my own from scratch as it was $10 vs $150
This was due to it being a smallish pocket foil. Naturally, I then went and spent 5 hours making a huge mess building the blank...so... I would probably buy a blank for a larger board.
I am currently working on a divinycell h80 cored 105cm carbon pocket foil. I gorilla glued two sheets together to build and set the rocker....