I finally got the Flyrig - I like it a lot as a backup. But the single amp simulation does not sound as good as the AX8, and the AX8 has 259 as many amp sims.
I talk about it here
I ordered and received the Atomic Ampli-Firebox and it sounded great. Honestly, it felt a little more "organic" than the Ax8, but it pops loudly when going from a/b. I'm not a roll ur volume guy, I need a switchable clean/dirty, so it's going back. The search continues