I have the Weiss 204 with the ModWright LPs upgrade and thing it sounds excellent. I think it has excellent resolution, wonderful tonality, and is vey open and clean sounding.
A few things to note from my experience. First, the ModWright LPS is simply a replacement of the basic PS that Weiss ships with the unit, so it is not an actual mo per se. Second, as far as US service, this will likely depend on what might need servicing. I originally thought that I might have had an issue with my unit (turns out I did not and the issue was elsewhere) and reached out to Weiss. Daniel Weiss very quickly responded and let me know that there was a firmware upgrade available, but I would need to send the unit back to Switzerland. Fortunately as mentioned the unit was fine, but just something to keep in mind. I did appreciate his very quick response though.