Best power wheelchair?

I'm hoping to find the ideal power wheelchair for my mother. I want to find one that moves slowly, so that she is not afraid to maneuver in it. If the speed is too fast, she will not use it, for fear of bumping into walls and furniture. Also, it should have adjustable arms that will allow her to easily access the seat, and then move the armrests back into place. Above all, it should be very sturdy and well-made. Has anyone had experience with these? I'd appreciate any guidance you can provide.