anybody good/bad experiences with these microphones?

I remember using a 3600 for guitar a decade ago. My friend had one, I plugged it in, spoke into it, and thought, "Gee, that might sound pretty good on a guitar." It has a nice deep, thick sound with smoothly rolled-off highs. Similar to a 421, but darker.

But, that was a long time ago and I haven't used one since.