Jc, I have never tried them myself. But my experience has been that moving yourself about using the strength of your arms can tire out your arms and cause your back and shoulders to ache. Can you rent some and try them out for a few days and see if they work for you?
I saw a lady in Washington that had the coolest contraption. It was a scooter of sorts - she put one knee on a little platform about knee height it and pushed herself around with her other foot. It had handles to hang on to and maybe brakes like on bicycle handle bars. I was thinking to use that and change sides periodically. Could you use something like this with your balance issues?