I have a SJ28 (in fact, she is for sale San Juan 28, 1980, Lake Ray Hubbard, Rockwall, Texas, sailboat for sale from Sailing Texas
) and she sails like a dream. I find that she points very well even with a roller furling. She handles heavy weather with ease though she won't hesitate to dip a rail if you have too much sail up (i.e., full 155% genoa and full mains'l in 20+ knot winds). In lighter winds she is very mild mannered. I find she balances very well with little effort. In fact, she balances so well I've used a jury-rigged tiller autohelm to steer her while close hauled in 15+ knot breezes. She is relatively light so carries some motion when in heavy seas but has no problem cutting through them. The most wind I've had her in was 50+ mph in a thunderstorm on the lake and she handled it gracefully (though was sailing near hull-speed bare polled). She is a well made boat and I will be very sad to see her go.
Good luck and have fun!