I've had my little Go-Go Traveller Elite for 2 weeks now, and actually used it round town and in the supermarket last Saturday. The batteries aren't new and we have no idea how 'worn down' they are, but while bumpy sidewalks and slight slopes made the charge lights drop one or two, the smooth surface in the supermarket was fine. Comfort-wise the seat was okay for me, too, but obviously not a captain's seat.
That said, I do feel that steeper slopes and long inclines (such as they have at Disney) will be no good for a tiny scooter - unless you are nice and slim, of course. So, on that basis I am going to go ahead of book my usual scooter (which is the Victory 10) as, while it is overkill in the weight limit, at least I know that I can sit in it all day and during shows and things, stay in it on the buses, and carry things in the backpack and in the front basket without worrying about putting strain on the batteries.
Also, as it is now October and we are 135 days away from our flight over, I think it's probably time to get on and book!