I can not even guess. I have so many kinds of tube amps: about 10 Marshalls, some Engls, Demeters, THD, Splawns, Boogie Tremoverb, old Fenders, ORange OR120, Trainwreck/Komet clones, etc,etc and to be honest, the amps in McRocklin's seem like their own thing. The Hi-Gain amp is very adjustable and along the lines of a Cameron/Splawn/Dumbly-Marshall maybe? , the Clean amp is pseudo Fenderish, and the EDGE amp isn't like anything I've used. The Acoustics have 4 variations and all sound incredible. This is a kind of 'Create your own rig' kind of software, in that the Effects are really really good and they match really well with the amps. I haven't even had to touch the IR's /Cab emulations or whatever they are, as literally everything is set up for you to easily produce great sounds. I know what I'm saying really doesn't make much sense, but many of you are very technical, and I don't use this stuff to be technical. I just use it , if it sounds great to me, if it is dependable and intuitive enough, and doesn't waste my time,etc. I wouldn't hesitate to recommend the McRocklin's suite to any guitarist who wants a really good sounding all-inclusive standalone program /and/or plugin. If someone just wants updates all the time and more and more amps added, it's not that kind of software, as it pretty much includes everything u need already. . Meanwhile, I can tell from your posts that you are MUCH MORE educated on this stuff than I am and very technical :) I'm merely a guitarist who has lots of great gear and plays in 2 weekend bands, and has played for many years and been a 'gearhead' since I started in the mid 70's!