I buy used all the time...but on the SDB I would maybe do a new one. I have bought 2 used ones and they both needed work. One went back to Dillon for a rebuild. Yeah..they did it free but I still had to py shipping.. Sitting right next to me as I type is a 550B i recently bought used. w/ 5 cal conversions 3 sets of Dillon dies all of it's original parts 4 toolhead stands 8 tool heads one of the brass looking ,primer flippers and an unused ammo disassembly hammer. Even got the manual for 330 bucks. But unless the price is very good buying new is the least trouble free...JMO. With the SDB the dies are included of course.