I don't own a II, I use the Ultra. Can I tell the difference between the Ultra and my old Triaxis / H&K EL34 combination? Yes, mostly in the attack. There is a quality in the attack of my old setup that is lacking from the models. But for live use, the Ultra has so many advantages including consistency, reliability, and versatility. Add to that the fact that it alone could replace my entire 12-space rack full of gear. I'll never go back to tube amps for live use. The Ultra is better than any other modeler I've tried, and is close enough to where the advantages far outweigh the disadvantages.
For home recording, I'm revisiting a tube setup using the Ultra for effects with the 4CM. I like the attack characteristics of the Triaxis/EL84 better than the Ultra, but I wouldn't use this setup live. I haven't tried the II, let alone with 6.0, and the models may or may not equal the tube rig in terms of my enjoyment, which is completely subjective. My recent use of the 4CM makes me hesitate when considering the II, for reasons posted elsewhere.
I don't agree that the forum is full of assholes. I don't even think the people who have written nasty things about me are assholes. They are defending Fractal against what they see as unwarranted questioning/criticism, and I'm sure they might be inclined to see me as an asshole. When two people are on completely different planets on an issue, completely unable to fathom the other's position, agreeing to disagree is not always an easy process. Briefly losing your temper doesn't make you an asshole.
Every forum has assholes, but it takes more than disagreement and a few harsh or poorly chosen words to qualify.
Edit: I could not confidently choose which is which in the clip.