Hello,
Don't have much experience with the DL250 because they are so new but, if its any help I service/maintain a couple of Suzuki GW250 inazuma's which have the same motor and general build quality.
They are used by couriers, not looked after as you would imagine but each of them are nudging the 50k milestone.
Apart from the usual consumables one of them had a new stator and regulator at around 35k and the other has had its regulator changed around 40k, Otherwise they are still going strong.
I reckon the DL250 would be a good buy.