I have the 15mm Macro and I have a friend with the 100mm 2x Macro. They are solidly built and sharp. However, they lack contrast, don't have the best lens coatings and aren't manufactured to the same precision as Canon, Nikon etc. The gaps allow for dust/particles to fit in between but they don't get inside the lens (yet).
Overall, for the price and uniqueness of the lenses, I think they are great buy. Few samples from mine:
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