bifold doors - anyone had experience of Sternefenster ones?

[tankerdale]

Our builder has recommended a local glazing company for the bifold doors for our extension. They use Bifolds made by Sternfenster. Has anyone had these?

I like the idea of using a local company and someone the builder is happy with, plus we need to match other Windows, but I'm aware they don't seem to be big players like Origin or Schuco.