I have a mobility scooter, and I use it with the same attitude I apply to my wheelchair - it gives me more spoons to use on
living. If I over-do a walk, and we all know it's so easily done, I can be off work and unable to move for days, so I think it's better to use the scooter or chair and maintain quality of life, so long as I am doing some form of exercise to stop my muscles from becoming completely useless - walking around at work and at home, going swimming, etc. It is very easy to become dependent, especially when walking is such a painful process, so I suppose it's a fine line to tread.
I have a plain black one that my mum bought for me. I'm in the process of designing some vinyls for it, and I'm making up a list of suitable bumper stickers to advertise the lesser-known charities that I support, including the HMSA. I've been shown some that say things like "young people can be disabled, too" but I think I would be more embarrassed about having something like that on my scooter.
Unfortunately, the rude comments never stop, but I tend to tune them out these days, and my OH has an interesting line in scowls for people who make loud and pointed comments about me! Unfortunately, a lot of people consider that if you're under sixty and using a wheelchair or scooter and there isn't something
visibly wrong with you, then you're just lazy. I've had my wheelchair for almost five years now but it felt too much like "giving up" so it was months before I actually used it and started to realise that the point of it was to a) prevent me from doing myself and injury, and b) to enable me to do things like going out shopping, or day-tripping, which I had all but given up because it was too painful. I still regularly get unpleasant comments (including one woman who crossly informed me that her mother hadn't been able to get a blue badge and wheelchair so why should a "young thing" like me have them and prevent people who "really need them" from having them

) but you have to let it slide (and maybe accidentally catch them in the ankles as they walk away, as my mother has done when she's been driving the wheelchair

).