It's the power tube mojo that still has yet to be captured by anything I've played (though I've heard that the Kemper, when running through its ridiculous like 600 W power amp, has gotten there, I've never played one). A cranked Fender deluxe, or Marshall Plexi has such crazy dynamic range. Without even touching your guitar's volume knob, you can go from clean to blazing distorted tone just by altering your pick attack. It's extremely satisfying, and, while I've had many hours of fun with everything from super clean to super distorted through solid state amps, I've never personally played one with the kind of dynamic range the old NMV tube stuff I've played has.
I haven’t played all of the top end modelers or done any menu digging with any of them. The Iridium is the only one I’ve actually owned. I considered a Tone Master Deluxe Reverb at a point. I like simplicity and immediacy of those designs.
The tone debate isn’t an issue for my personal wants/needs. They sound really good, just like tube amps. I’ve never played one that can respond like the tube amps I’ve had and that’s the most important part of an amp to me overall. I don’t really care how close for better or worse the tone is if it’s not responding similarly.