I have never had a problem getting a seat at Fantasmic. The only time it was super crowded was one of the holiday weekends, maybe labor day weekend... we arrived 5 minutes prior to show time and had to sit on the lawn. All the others time we've had no problem getting a seat, especially in Jan when it's cold and some people won't even do Fatasmic because of this (the theatre is on water). It's up to you, does the price justify the ease of seating to you? I would just suggest showing up 20-25 minutes before the show... if on a weekday. I once showed up an hour early and regreted it, no one came in and half the show was empty ... this was the first week of December. Are there other days in your trip that you can go see Fantasmic or is it a one day thing?