I just finished filling out a survey asking what I thought of Disney transportation. It asked if I used something like Uber while staying at the Grand (we did) and then asked a number of questions about if we would use a similar Disney branded service that went all over property and possibly to the airport. My thoughts are that I'd use it depending on price. We primarily used Uber to get to Epcot, the beach club, and Typhoon Lagoon. Used Disney transport for everything else, but if it was cheap enough and could pick you up in 5 mins or less anywhere like Uber does, I'd consider it. I'll see if I can post screen shots.