Most high end speakers will last very long time without requiring repair or maintenance, so unless the owner has abused them buying used should not be a problem, but strongly recommend you at least audition the model you're interested in at trade show or dealer. Very risky to buy speaker based on review only and I personally would never do so, especially in the high price range.
Another great option, depending on where you live and dealer availability, is to buy a floor model that dealer is selling. Usually this will still have warranty and can be had for half retail price. Many of these can be found on audiogon as well.
Another great option, depending on where you live and dealer availability, is to buy a floor model that dealer is selling. Usually this will still have warranty and can be had for half retail price. Many of these can be found on audiogon as well.