Alimo I grew it for the first time this year, tasted like...well lettuce! Space need, each one grew to the size of a cos, but less compact. I used mine as a cut n come again, picking the leaves as and when needed. Didn't try cooking it.
Grew well for me, and once it got going didn't seem to be slug fodder like the rest of my lettuces!
Have a few seeds left, if you wan't them PM me with your address. DP