I got my new 5bay Synology and I am want to populate it with 2-3 6TB drives now.
I find some really good deals here in Germany for a
HGST Ultrastar 7K6000 HUS726060ALE610 Int HDD 6TB 7200RPM
A new one costs 110 Euro (other competitors are in the range 120-140) and the same but used for only 50 Euro from an online shop.

Do you think it is worth to try the used ones or is it a trap? What would you do?