Yesterday Me and a buddy, couple of (well) over 200 pounders, went on a 228 kilometer ride in my CF Moto 800 Trail, on trails that were so steep, bony and rough for long stretches that despite care being taken, the Ricochet skid plate would ring off the rocks like a blacksmith's hammer on his anvil. 11 hours in the seats. At the end of the day my 64 year old carcass felt just fine. My buddy said the same when I asked, he found the seats to be quite adequate and comfortable.
I assure you that from plenty of past experience, if I'd been on an ATV for that day's journey then at the end of the day I'd be walking like Frankenstein with hemorrhoids.