Well, although I haven't used it, I do know someone who has spent quite some time with it. 6x17 is an awesome format that I wish I could get into more. The problem that he cited with the Shen was that he seemed to consistently have issues with film flatness, so no matter the lens, things weren't always sharp across the whole image. Like old Soviet cameras, perhaps only advancing film just before taking the picture could alleviate this.
Have you considered Fuji or Horsemans? More expensive, but I have used them and can swear by their quality.