Mobility scooters - anyone had any experiences

[KAgantua]

My mum is getting on a bit and has COPD so even just going up the stairs is a lot for her

Shes after a mobility scooter, and isn't afraid to spend a bit of cash to get something decent.
- Secure
- Good range
- Powerful (ish)
- Nice to drive

Im also wary that like with anything to do with old folk, its a minefield of scamsters and charlatans.

Anyone got any experiences.?