They Axe-FX is pretty well regarded by ex-Mesa users - I gather the designer is a big Mesa nut, and his models are about the closest thing to the real thing that anyone's played.
I haven't been blown away by the clips I've heard (great for a modeler, but still lacking something), but I don't know how much of that is the fault of the user, the fault of the Axe-FX, or latent tube snobbery on my part coloring my judgement.
