1600 miles in the first 3-1/2 years, then 200-250 miles a year since. Two owners, most recent a 60+ female nurse who has been using it to get to work. Getting too heavy for her so she’s hanging up her crash helmet. She takes it for servicing and they tell her it doesn't need doing, just an oil change will suffice. Note MOT runs out in June 2020.
I'm very tempted but logistics a bit of a nightmare with lockdown and house move.
It's not as if they don't come up for sale regularly so no panic. I've re-read your opening post & IMO a Burgman 400 is overkill for what you say you are going to use it for, higher tax, insurance, mpg and for no appreciable gain.
As another poster suggested, an Xmax 250 would be better if you don't want to drop to 125cc.