This is one thing I don't understand:
Surely commercial developers (Amplitube, S-Gear, Guitar Rig) have a Kemper and Axe as part of their R&D and have been analysing and comparing their sims against them, along with mic'd amps that are modelled, and must have some quantitative idea where their sims depart from the real thing / Kemper / Axe. There is nothing the Kemper or Axe is doing that an Intel i7 couldn't do. It's only a matter of time before they catch up - and I think x50 and S-Gear have.
Now, the Axe is using cabinet IRs, the same as amp sims, so when Mr Developer runs a sine sweep through his sim and the real thing/Axe/Kemper of an equivalent amp (or VST analyser equivalent), surely it's clear as day where the discrepancies are. I mean, if you're not prepared to be the best at what you do, why bother? And the way to be the best is to understand how your competitors' products are (or perceived) to be better than yours.
I'm not a developer of amp sims, but I'd like someone to chime in who is to tells us exactly where they think the weakest link in amp sims are.
I refer to amp and cab sims, not FX units, which I'm aware the Axe excels at.