We flew them once from Louisville....it was actually quite a nice flight. I had had some not great experiences with charter flights in the past so was a little leary...but they had plenty of staff available for check in, nice flight, nonstop...they even fed us breakfast on the way down and a light dinner on the return (although I have heard they don't do that anymore)....Flying into Sanford was actually fine also.... added about 20 to 30 minutes to the drive time to WDW....but we saved almost that much time getting out of the airport (no wait at rental counter, car right across the drive....10 minutes and we were on the road)...I would fly them again in a heartbeat if the times worked for us and the price was right.
The main issue for us is they only fly on Fri, Sat and Mondays from here.