The Lippincotts started out building quality race boats. The Lippincott 30 was intended to be a performance cruiser/racer. They offered good perforance for their day.
I would expect these to be reasonably well constructed for use as coastal cruisers. Although I have never worked on one of these myself, I have never heard anything negative about their construction. They are getting a little long in the tooth and so may need some of the usual older boat repairs, long term maintenance or upgrades.