Well, performance-wise most the Farr 30 speaks for itself. That should be pretty clear what you're get so himself into. High-performance racer day Sailor. Nothing more than that.
In the United States the Farr 30 is made by Berry Carrol at Carrol Marine. Carrol Marine focused on the first four years of boat ownership, when the original owner was going to campaign the boat. after that he didn't give a shit. So the boats actually were not well-built. Most people don't own a boat made by 'barely careful' after the original owner.
Look for wet decks, stringers separated from the hall, and bilge reinforcements coming off of the liner.