Generally not a fan of JJ, at least 12ax7. The EL84s they make are ok but I find the 12ax7s they make to be a little stiff/harsh. If I remember correctly, I probably used a ruby tube that tested well as part of a matched pair (but the other broke).
Great notes on the kemper.
When I first read about how it worked, it seemed a little bit like the way synth companies used to use sampled piano sounds, ie a low note mapped across a range, a mid pitch note w/same, and high note mapped similarly. Made me skeptical about kemper since I could usually detect where the samples were starting to "over-reach" their ranges, and a homogeneous sense of overtones within those ranges. But pretty sure that whole thing is much improved these days- likely a bit of modelling mixed in with the sampling approach. Can't really beat something like that for portability. Definitely interested to check one out, and the axe-fx as well.
Love that you were able to repair the scratch and dent one- I think I live for that kind of thing sometimes.
Dying to try some of the newer EVH stuff too, and in general also love 3/4" birch cabs.
I tend to stay out of guitar shops these days though, my liquid $$ are tied up in other things like starting my own biz, orthodontics for the kids, etc. Pretty sure if I try any of these things, bias head, kemper, axe, evh, I'll want to buy one. Of each.