I've done his ECSD x SS. Interesting for sure, structure much improved in terms of branch strength over ECSD but the SS dominates the cross heavily. Good uniformity. Big yields. Long flowering time. Interesting and nice nose and smoke. Probably not a keeper for me though - going to S1 some to see if I can find some ECSD leaners with better structure.
His cookies S1 produces really awesome plants. Super potent/frosty. Not big yields or vigor but damn nice smoke. Keepers for sure - multiple in 9 plants. Going to chuck some pollen from or on them at some point.