I have been to the lens archive. I see many people that were posting no longer have this lens in their signature. Is this one of those that people think might be nice to have but after trying it find out it isn't what they had hoped for? It would fit in great with my extensive line up of 2 lenses. I also really like to shot close-up stuff. I would love a lens with this capability yet could be used for regular work as well. I hate not having infinity focus with extension tubes and close up filters. Is this thing sharp enough at the wider apertures? I don't see tons of people owning this one.
I sold it simply because because I added a FF body and wanted the option to use macro on both bodies with ease. In the back of my mind I figured a little extra working distance might not hurt for bugs either, but if I had stuck with APS-C I would have stayed with the 60 until the 100L arrived.
I think the 60 is actually slightly better optically than the 100 non-L USM, if anything.