Totally ridiculous. NOTHING makes digital hardware better than software. It's just chips and that's it. As for analog stuff, they've done blind listening tests comparing software emulations with their analog counterparts, with teams of trained engineers/producers/synthesists and the differences are anywhere from nearly unnoticable to not there at all. It's very easy to make a broad statement about bullshit like "analog warmth" or "boldness" but really if I sat you down and played a TB303 followed by the Audiorealism Bassline, or a DX7 followed by fm7, you would not be able to tell the difference, I guarantee it.
As for some demos of guitar libs, here are some demos of Bela D's latest, "Lyrical Distortion".
http://www.beladmedia.com/lyrical-distortion-demos.htm
It's only a 3GB library or so. There is a 100GB guitar library as well.
I would like to ask... Is the library that we can buy for 150$ really sounds like the samples we find following the link. I mean tue quality is great for only 150$.... Did someone already buy it?