I prefer the design of the tiller/lever on the scooters they have to the design of the ones Walker Mobility used when I rented from them. The Buena Vista lever can be activated by a few different motions, while the Walker one needed the thumb. My thumb and hands were quite painful after just a short while using the walker scooter, but have always been fine with the
Buena Vista scooter. YMMV.
SW