I think Sewing Machines Plus is a reputable company. I've only bought small items from them.
I owned a Gammill Classic Plus and test driving to me is important. At large quilt shows you can put your hands on several different machines, some are smoother than others to operate.
Think twice if you have any back problems. It was not my smartest decision. Of course I bought mine in 2004 before the computerized models became popular. I just sold mine to my BFF as several years of not really being able to use it myself.
JMHO from experience.