Fangpusun copies and then sells the XTM and XTH versions of Studer inverters. Studer supposedly is opening an office in Miami, but for now is still delivering product from Switzerland. They are also showing what looks like a similar product to Studers' new line called "NEXT"
The Fangpusun units are not made in the same factory, but supposedly source many of their parts from Germany and Japan. The pictures on line of their products show very nice workmanship, and numerous people have given them pretty good marks. Of course, you can never know for certain if those photos were actually of their units, or an actual Studer.
It might be worth trying one out.
Good luck.