Tayana 42 Center Cockpit
The Tayana 42 is a respected design. They offer reasonable performance for a boat of their weight, good offshore capability, and a high finish level. Robert Harris is a respected designer best known for his Vancover series. The V42 is generally seems to be considered the most successful of that series.
Some things to watch for. Some of the V42''s featured teak decks. Teak decks are generally more maintenance and likely to be a very serious problem as the boat ages. They also raise the center of gravity (reducing stability and increasing rolling) on a boat that does not have an extremely high displ/ballast ratio.
I believe that some of the early V42''s had black iron tanks which would be close to the end of their useful lifespan. Tayana allows a lot of customization of their interior layouts and some of these are biased toward being more comfortable as live-aboards which results in some compromises such as a lack proper seaberths, front loading ice boxes, and wider cabin soles which can be quite dangerous at sea. You need decide how you will use the boat and look at the boat from that perspective.
Generally, the aft cockpit boats are thought to be the better set up for both live aboard and offshore work since the double end limits the room for a comfortable aft cabin while pushing the cockpit foward into prime real estate for the main salon.
Some of these boats had a 30 hp yanmar engine which is really a litle small for a nearrly 30,000 lb boat. The more common 45 to 50 hp Perkins seem better suited to the weight of the boat.