Hi David,
Honestly, I had not heard of Apple Scooter but after receiving your ? I did some research. Although I've had no personal contact w/ them, most of the reviews I found were positive. With any rental co., read the contract carefully & ask ?s before you sign. Make sure you have a good contact # in case of any problems. Make sure you're aware of what their replacement or refund policy is should you have difficulties. They should give your mom a good overview of the ECV when delivered.
If your mom isn't familiar w/ using an ECV, take her to a local store (i.e., Target) to practice. Some attractions allow guests to remain in their ECVs, some require guests to transfer from ECVs to a w/c to board & others require guests to be fully mobile. Click
here for more info on mobility disabilities including boarding requirements (also printed in your Guide Map).
ECVs can be used throughout WDW. Monorails are equipped to handle ECVs & have a ramp they use to load ECVs - practicing will pay off here. Most buses have a lift for ECVs that are 32" x 48" or smaller. The larger boats are able to accommodate ECVs but some of the smaller ones are not - its just not safe. Be sure to ask the Capt or Cast Member near the docks.
The best way to protect the ECV is to keep it in your room. If you're staying on WDW property you may want to request a handicapped accessible room. You can also check w/ the concierge at your resort to see if there are any other options.
For those times in the theme parks when the ECV must be parked it is generally w/ the strollers. If its too far for your mom to walk, speak w/ a Cast Member. Always turn it off & take the key out of the ECV. This helps to extend battery life & keeps it safe from joy riders.