I think both version of Space (in MK and DL) have some amount of jerks just do to the nature of roller coasters (i.e., sudden turns and drops). I do think DL's Space/HyperSpace is less bumpy than MK's Space. Some of this, I think, is due to the seats. DL's seats are real seats (i.e., you bend you legs to sit on a "chair" in the ride car) opposed to MK's Space which you sit flat on the ride vehicle (like a sled). (Note: DL's version of the sled type seating is at the Matterhorn, which is a very bumpy attraction.)