The Lancer 30 was not built by C&C, but the hull design is by Cuthbertson and Cassian (C&C). Lancer built the boat.
It's design pedigree should result in reasonable sailing characteristics, C&C knew what they were doing. The construction may be another story, but I'm not aware of any issues with these boats in that regard.
It has an unusual layout, if I recall, with a forward settee and table, and an aft berth. This was very unusual when it debuted, but others have followed that idea since. It may well work for a couple. I remember seeing one at an early '80s boat show - it seemed OK on the boat show floor.