I have two Catweasel II zorro boards on my systems at work. One is in a rev. 4.2 A2000. The other in an A4000T.
Got these for the HD floppy support. When the A2000's GVP-M 060 card acts up, (Not very often.) I stick a spare IDE drive on the Catweasel. Booting from there I can usually fix the problems easily, or even run the Video Toaster if I have to.
Two or three years ago I had some issues with one of the boards. I e-mailed Jens. In less than 24 hours he replied with several suggestions. It turned out to be a minor connection deal. Problem solved.
I've been happy enough with these boards that I bought some of Jens products for my home system.