I orderd some of 'the coup' earlier this week and it just arrived!! Matt was really fast to respond to my questions, and really nice! So, what they're sayin' is they have an easier, more workable, MID-Fire porcelain! Sign me up? Perfect timing; I've been fantasizing about really moving to porcelain and wanting to find a mid-fire. Looks like I have; I am excited to see how it performs.
At the very least; check out Matt & Dave's Blog Slipcast - it's all ceramics - all the time!