I test drove a Premium and a Sport, today. Neither car is particularly 'sporty' by my standards but the one thing I wanted to check was whether the cars had different sway bars since that has been an easy upgrade path in the past. NEITHER car has any rear swaybar that I could find. It definitely isn't connected to the lower control arm like recent generations of Subarus, although the hole is there where the endlink traditionally mounts. The Sport had a 22mm front sway bar. The Premium seemed to have a 21mm but it could have been measurement error while I reached under the car with my micrometer. I suspect it's more likely that they have the same sway bars. I believe the Sport might have better shock damping but it was hard to tell since the test-drive loop was unfamiliar and the roads were fairly smooth, even driving the cars back to back.