I finally got a chance to try out the Dr Bonkers Marshall pack, and I like!
My provisional Next Big Plan allowed for picking one out of this set to load (more slots please Line 6, lots!), but in the end I kept all of the mixed ones except one. Didn't compare with other makers, just pulled up an amp and went through them. Some are darker than ones I typically use, but I found them quite fun and useful.
I didn't have the time or brain space to try the single mics, just the mixes, of which there are some not super common ones. Didn't care so much for the PZM ones, but they're an interesting idea, if I had more IR slots I might keep some around.
So bottom line, I definitely recommend these, not your standard fare!