(for any who don't know, USP - Unique Selling Point)
At the risk of, um, blowing my own trumpet (an expression that isn't terribly appropriate for a violin shop!), no-one else does customer service like I do. I have just been reminded of this today. One return I am not required in law to accept at all (customer damage), one I am obliged to accept but not to pay for (buyer error) but am paying for anyway, and one favour offered to someone who phoned me, a favour I did not need to offer and that made me no money at all and would probably have ended up costing me fuel,though in the end it never materialised but only because the person concerned did not have the decency to tell me she had changed her mind.
Where else will you get customer service like that?