There was quite a discussion on this on Pirate years ago. Desert racers NEVER use suspension seats. I have a couple MOMO carbon fiber shell seats with foam that are used in desert racing. Something about potential energy from downward inertia being compounded by suspension seats loading up on a hit. No idea. I've raced the mint in a POORLY tuned 10 car, 7 hours straight, huge ass whoops and aggressive driving and my back felt no fatigue on the momos. They kind of hold your back slightly bent "hunched" at the bottom. At a grand each, I hope they know what they're doing, they still feel weird as ****. I'm sure there is more science to it than we are discussing here, I can't imagine a suspension seat not being better for a full chassis bottom out under the seat so it is not such a hard stop. I'm not always right though. Every Year we raced KOH, 7 of them now, and 5 aggressively with reckless abandon, we have been in PRP, Mastercraft, and one year of ProArmor suspension seats, and all years were 7 - 14 hours and also, no back fatigue, but maybe in none of these anecdotal instances did we ever take a hard enough chassis or G out hit to make me feel much.