I have a US27, Love the boat, currently upgrading the interior, Put in new stove and replaced all the cabin lights with upgraded fixtures. the US27 is my 4th boat and I really like it, Lots of room for a 27, lots of old school wood in the cabin.
With a hand laid hull it is pretty strong, but like all US Yachts I have been challenged with window leaks.
The aux power is a 8hp Honda outboard.
By all respects it is a fun boat to sail and given proper care it should last a good long time.
As I recall the US27 was only in production for about 3 years.