@tannoy56 Why mention cars if you are not talking about cars?
I have bought a number of items ex-dem,. amps, speakers. Arguably they have been lightly and carefully used and don't have too many miles on them. A warranty can be negotiated. They will probably still be in manufacturer's guarantee. The discount is substantial, if not as much as used. Worked very well for me.
One issue to watch is they may have travelled a bit. Look out for small knocks etc. The original packaging is sometimes damaged. My Martin Logan CLX Anniversaries were original packed in cardboard even though they are delicate and heavy. It got them from UK seller to France but was disintegrated by then. So I had trouble getting them back to UK again when I returned. COME ON ML, PACK YOUR COSTLY STUFF PROPERLY.