Tried the Sci-Fi this past February. We didn't have a PS (party of 4r) and showed up right at 11:30 as they opened and were seated in about 5 minutes. However, when we left around 12:30, the host was telling a party of 4 that just walked up without a PS that it would probably be around a 45 min. wait.
scanmom - sorry to hear about the cheeseburger - I had one with swiss cheese and mushrooms in February and found it very tasty and moist (in fact the bottom bun was a little soft - but I liked it that way!). The fries left something to be desired - they were too reminiscent of Ore-Ida crinkle cuts. The cookies and cream milkshake that my DH had was delicious.
The Sci-Fi is on "the list" of must do's for our January '04 trip.