OK, quick update: I did 4 jumps on the Sensei 121 today. The openings very definitely faster and not as predictable as the Crossfire. Flight characteristics were very much as expected: faster than the Crossfire, MUCH steeper turns, longer recovery arch, good flare. I do have to agree that 121sf is probably too big for me (I am 205 lbs). It seems that you got to downsize 20% from an elliptical to a x-braced canopy. I will try to test a Xaos 108 and a Sensei 111 in the next week. I'll keep you posted.