I cannot ride the teacups.... I would be sick for the rest of the day.... no exaggeration! I can't even read in the car any more and if I am the passenger for more than an hour, even with no reading, I get feeling a bit ill/headachy (only since I turned about 30 however!).
That said, I had NO problems with M:S. I followed the directions (keep eyes and head facing forward, don't try to look around) and I had no troubles AT ALL. I rode it two or three times one day.
HOWEVER, in my humble opinion, the ride is not so exciting and thrilling that it would be worth feeling lousy for the rest of the day. Other than the feeling of the g-forces at the beginning of the ride, which were quite intense, I felt that the rest of the ride was just sort of ho-hum. ..........................P