If anyone is still on this thread, are you able to tell me how jerky the RIB boat is? I get that it goes fast, and does donuts etc, which is great, but my husband has some back issues and jerky movements could potentially put him in spasm. He'd probably be totally fine, but just wanted to know if it is or isn't a jerky ride with sudden turns, as if it is he'd probably skip it and do one of the slow boats on his own.