I don't have much experience with tube amps in the wild, though what I've heard either I didn't care for, or was too loud for me to appreciate. I was very impressed with FW6.0 ....and while some things were gained through 9.0, the feel element seemed to pull a hair back. 10 has got it back, plus.
Also, the high cut in the cab block works like how I thought it was supposed to work. Before, turning it down past 8k made the tone stuffy, too or not the right kind of attenuation I guess, but now I can turn it down to below 5k and hear them mids without all the shhhhhh. I go farther than that by turning down the power amp high cut, and it gets even better. The treble gets even rounder, and not at all wimpy.
And the pick attack is, like, under the tone, even up in the treble, without doing any weird cab configurations and stuff. Especially after the treble cuts, that's stupendous.
Lastly, the overall tone seems more integrated. If I add some depth, it's a part of the body of the tone, rather than sounding like an eq bump.
I tried FW10 a couple weeks ago, thought I had something, then went back on it, back to 9.0 . Last night I climbed back on, and just this afternoon am getting some ki-ller tones - with only drive/amp/cab - trying only one amp so far.
I want to mention that I don't play vintage anything, I use a lot of gain. The vintage guys are pleased, and that's good, but I haven't seen a lot of gainers giving the same praise.