I like roller coasters, but some of them scare the heck out of me. I also have a motion sickness problem, but take medication for that and am usually OK, unless the medication wore off...then I get pretty dizzy, etc.
Personally, I like the modern coasters (the more padding, the better) as opposed to the wooden ones. I got black and blue on a wooden coaster that had no padding on the side of the seats.