Ok, I just listened to all the tracks and thru my MOTU Traveler and JBL LSR 6328P speakers it sounds like a real good guitarist. The tones they are getting are pretty close to what I would consider production tracks for something like a TV commercial.
I am familiar with and a fan of most of the source material the guitarist is quoting and none of it sounds like it has the fast transients of the original recordings of real speakers being spanked by a tube amp. I know many of the samples feature compression but there is a sparkle missing to my ear. No Sparkle = no excitement... its just commercial grade sound. Some of the stereo effect and creative panning made it more enjoyable.
For examples:
Plexi Metal track: it sounds thick and juicily compressed but in a dead sort of way. A well recorded Marshall has a shimmer that serves as a foil to the squash.
Twang Blues? Compare it too the Stevie Ray record... this guitarist is hitting the licks like a real pro but there is none of the low end excitement that exists in the original recording
AC Box Jazz... ok got me there, it sounds pretty authentic and the finger note solo do have a nice attack.
AC Box Country: Flat like cowpie
Plexi Rock Riff: Go listen to the ACDC version... once again the copy is just kinda flat.
I'd say a general lack of quick transients would be my chief comment. They sounded less unlifelike on my laptops speakers.
But I could see how something like this could be useful if you were compelled to fill up some space on your next recording.
There is a reason electric guitar conquered the world. Even when it was squashed into a small AM radio speaker it could reach thru and give you a case of the willies. I don't think these sounds are of that caliber. Specifically none of them convey a sense of control vs recklessness held in balance by the sheer wizardry of the player. The guitarist is ceratinly hitting the notes and pushing the rythym but the visceral effect is still flat.
best regards,
mike