Hi Ian,yes I have owned 2,the best 250 ever made by Honda. A no frills 250,will knock spots off a 250 wet dream.
But saying that its a 4 valve head and I would guess this would need attention. Highly reliable,if used daily, can be a sod to start if left to stand.The gear lever pivot lug is vunerable to being broken off, when dropped.
The one you are looking at ,looks as thou ,its been messed around with.Some hipster upstart,chopping the mudguards around and bandages around the exhaust pipes,and the seat is in a mess.Seller hoping to get a cool price,because it looks "cool".
Also they do use oil. Nice thing is the the crankcases split horizontally.
Judging by the pictures ,I would not offer any more over 4OO for it,or spend another £1000,if you find a better low milage example.Hope this helps.