Very sturdy and allows you to walk in a normal straight-up position when using--no hunching over needed. Handles height is adjustable to fit your desired height. Has braking system, if needed. Can fold it up right in front of you for use in tight spaces, i.e. elevators with other people in there. Keeps their looks over years. I have a 25 year old one; a 15 year old one and a new one--all perfectly usable. (Keep one always inside car or car trunk.) A wonderful product and have had even doctors, etc. stop me to ask about it and where I got it!
Practically none. The 8" tires' treads will finally wear down too low for brake pedal to reach them firmly or at all (mainly if used outdoors a lot on concrete, etc.) but you can order a set of new tires. Also, is "all terrain" but a bit harder to go through sand, rocky ground, and uneven grassy areas, as would be expected. Rolls effortlessly over concrete or asphalt or inside houses or buildings.
kathryn j. from delmar new york, ny
Female, age 79 in upstate NY, with balance problem from limb-girdle. Balance problem when walking solved-- and in completely upright position.