We were at Sci-Fi on the 21st for lunch. We had a PS for 12:20, we checked in at 12, and were in at exactly 12:20. In my opinion, MGM was crowded that day, the line of people trying to get into Sci-Fi was crazy, they were telling people without PS times to come back that were more than two hours away.
Everything we ordered was tasty, but it was a very heavy meal. We didn't eat again until nearly 10 o'clock that night, when we grabbed something very light from the Family Fun and Food Center at the CR. The novelty of Sci-Fi was a lot of fun, my DS11 especially enjoyed it, and our whole dining experience lasted just a little over an hour. They were very prompt with our order.