Poster on this site had a used one for sale and I bought it. If it had been another brand of "used" scope most likely would not have purchased and reason is simply that the warranty/service I have experienced over the years with Leupold has been first class.
Scope is the basic 10x w/ mil dot reticle and not so large to dwarf the rifle. Simple to use, just look through it and pull the trigger, no batteries, switches, etc. Saved quite a bit of money going this route and see no "combat" activities in the future for me so the scope should serve me and others well into the future. Have no intentions of selling the scope, but you can bet as soon as the MK 4 series becomes "unobtainiuom " to the market, the pricing will go much higher for solid used Leupold MK 4 scopes. Supply and Demand rules.