Sun Yachts were built by Spencer in BC, they produced the 838 (27'), a 31 footer and after a short time began to market themselves as "SUNSTAR", which are the same hulls with slightly different window treatment.
They seem to be reasonable coastal cruisers, plenty of them around here. They have a good amount of space, fairly high freeboard but good headroom. Build quality would be average-to-good, Spencer has been building a lot of semi custom bigger boats for years, (many of which have done extensive ocean passages) so they know how to do it.
The 27 is probably on par or better quality wise with a Catalina 27 but is a much bigger boat.
The Sunstar 31 is a nice looking boat, actually suspiciously similar to the S2 31 footer. I think that there were many more 27s (8.38s) sold than the 31s. IIRC the 31s were underpowered as standard.
Here's a link to a Sunstar 28 (later version of the 27) Does it look similar?
Sailboats: 28' Sunstar 28 - Listing #: 2483
As always, get a good survey and check it out. I believe they both used encapsulated ballast rather than bolt on keels, underwater profile is moderate fin and spade.