His health and durability are not that bad. He is worth signing. His contact rating alone coupled with his other numbers will make him a very high AVG and OBP guy, which is valuable. Even if he tops out at 85 OVR and you don't need him or like him, you will be able to trade him for pitching talent that would have cost much more on the IFA market.
Plus I am of the opinion that decent IFA's should be nabbed when they come along, even if early in the season. It is better to get a future big leaguer in IFA than hold your money for a future HoF type that never comes along and you are left holding cash at seasons end.