As other have already said....the reputation SVS has built speaks for itself....but should have the need for a warranty issue they will honor it without issue. So in that regard, have no worries with buying used. But if you can find a used Ultra, I would take it over the new Plus. Although, it just depends on the size of your room and levels you wish to attain--a new plus might be more than enough depending on such factors. Although is you buy a PB13 used, be prepared to pay alot more than the $99 shipping SVS charges, as when I was considering selling mine the shipping quotes often came out in the $200 ballpark. In which case it might make more sense to just look for one in the b-stock section or go with the new Plus....