I went with the 9-10. We will get on that and ride it about 3-4 times without getting off. Nice just to rest and relax. My son actually passed out one time and we were on it for about 45 minutes. Not one of us complained.
I am glad to know that our family is not the only one that rides it over and over. It is just a great time to regroup (and eat a bucket of popcorn...).