I got this set not long ago (here). I ripped out my Zmodo 4-ip-cam set that was junk.
This is a much better unit. The cameras are connected with the twin BNC & audio cables which are widely available if you need more than 60 feet to reach anyplace. The cameras adjust with allen set screws that are a little awkward to use, but the cables can be entirely hidden, unlike so many other cams. The picture is good, and the night vision is good too. I found no disadvantage to the set being refurbished.