Universal and Good

The converter itself is on both XZ -... very good (and because of vignetting only in telephoto position) usable. There are also some bridges that are to be used with this, probably with each other adapters.

An unexpected additional benefit it follows up on some MFT lenses (connection partly Stepup- or Step Down Rings). So already on the quality of a crop surpassing results was with the M.ZUIKO 60 / F2.8 Macro and the M.ZUIKO 75 / F1.8 reported. At Panasonic 45-175 of the entire focal length range is even available and exceeds the performance of a crop also.

However, what really is not good: There's no way, a filter or to recognize a Geli. That leaves just tinker.