My opinion, AT5 has great sounds in it and is easy to dial in - of course I'm used to IK's modeling

I've been using Amplitube as a serious alternative to recording real amps since like 2010, and used it professionally to do demos etc. without issue. Used to have to bypass the cabs to use IRs for the best sound quality, but AT5 has good cab sim also so that's been a nice improvement.
Some of the older Amp models from back in the day aren't as exciting but I have recorded this year with the old Engls and the Jimi Hendrix collection gear which is all like 2012-2013 and loved the results, and some folks have noted they liked the guitar tones in some tracks this year too, all AT5 thus far. I also use it on bass on tracks. The newer models have wow factor for me, and there is some awesome and uncommonly modeled gear in their more recent collections.
As far as IK software generally, I just got done with that awesome group buy and I keep loving what a bunch of the software I got does for me. Sampletron 2, Sunset Reverb, Comprexxer and more are in my tracks right now big time. Also never had any issues with their CS, Peter has always been cool to me and answered questions. I am pretty easygoing and try not to argue on the internet, takes too much time and focus away from creativity and the pursuit of the ethereal muse (things I'd almost always prefer to be doing versus going back and forth in heated posts) - not to mention talking about gear with cool people like this thread!
I do like other modern Amp Sim tech too of course, working on a track now that uses a few Nembrini Sims which I got into after trying and liking a bunch of the models he did for Brainworx/UAD (especially love the Fuchs models he did but after the Pete Thorn signature sale brought the rest to $29.99 before vouchers I got all of them I wanted at about $9 a plugin average and have been quite pleased, some are amps that AT5 doesn't model). I have also thought about getting Neural Gojira or Cory Wong in the current sale, more processed sound but it's huge right out of the box and I liked their effects also.
All this tech I find very exciting, it feels like we can do things in the box today that have never been this possible. Love the sonic playground.