The Vanguard twins, which have always been made only by the Vanguard series' designer, Daihatsu, seem to have have sold well and enjoy a good reputation in the field. The Vanguard singles were designed by Daihatsu, but were never made by them. Instead they were made first by Briggs, then by Mitsubishi, then by Briggs again. They have not sold very well. Nevertheless they do not have the characteristic design flaws of the large Inteks (which are a Briggs redesign of the Vanguard, to achieve lower pricing).
Your comments on the Greenfield line up exactly with my impressions, which is reassuring. There is no substitute for actual experience, particularly professional experience, with a product. You have that experience, and I don't.
