I’m the vet that posted those comments and I have been using this Firefly more and more and it is awesome. It gets up to about 15 mph and to transfer is a breeze because it attaches to your chair with 4 quick disconnects. All you do is disconnect 2 on one side and it folds out leaving it open to transfer out and in it. Great fast chair. Especially if you have had shoulder surgery like me or have problems pushing but you want to continue using your manual chair. Also you don’t need a lift you can disconnect it and fold your chair and put it in your car. Truly awesome invention. Tim