I think restraints are BY FAR the most important part of a coaster. There is nothing worse than when the restraints on the Magnum decide to really hurt your legs, ot when the restraints on the Racer, Beast, AND Son of Beast decide to go down an extra notch at the bottom of the first hill and prevent you from any airtime or comfort(it happened to me twice, only once on the Son). Look at the Outer Limits rides, they are a little rough, but mostly because of their nasty head-swallowing harnesses. Then oyu can look at Intamin or B&M hyper lap bars, very nice and comfortable on the legs. I personally don't like any OTSR mainly because I haven't seen any that don't swallow my head and allow for comfortable airtime, Arrow's don't swallow your head, but hurt with Airtime. i like S&S's, but those are only for vertical movement. Well, anyways, I thin that this is most important to a coaster's ride.
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Coasters- a little slice of heaven