Received my 2x tele conversion lens, 0.45x wide angle lens, and a macro lens today. Tried them on a colleagues x100 (apparently he had bought one after trying mine some months back). anyway i have to report thus:
-the quality of the lens units looked excellent. BESEL is the make. They were quite weighty and looked well made. However, the distortion (considerable), CA and complete lack of any sort of sharpness toward the edges, just did not convince me to keep them. With the teleconverter, I expected be able to get a little closer without getting closer (if you get my drift). sadly it changes the length at which the lens focusses so you lose the benefit. Not impressed really, which is a shame. Well, you have to try these things. I think the X100 lens is best naked. Didn't bother putting any pics up, sorry. Was too underwhelmed to bother.
Also, they create a helluva shadow with the in-built flash