Hy, I have an original sport Nivo chassis (Nivomate) in my car. I renewed this about 3 – 3.5 years ago. But as I wrote in forgotten Fred, it is a bit too tight, not hard but too tight. Since I have a load eel with which I carry heavy things anyway, the Nivomates are pure luxury in driving behavior. Now I think to install a screw suspension (best of all turned up so that it stands original and inconspicuously there. Have now looked at some , and often you can also be lucky with a 400th chassis (new NoNameCompanies also want to be on the market and have probably built what good?), but I think this is rare. Now I ask myself (since some always mean KW or nothing) if you really notice the difference between Variant 1.2 or 3 or need ? Which one of you has one inside and how is it (e.g. with channel lid, in winter, ect.) ? I thank you beforehand !