.played the axe fx ultra for a few hours the other night through a mesa 290 and my vader 4x12. we played my hellraiser 7 with an 81-7 in the bridege and his ibanez custom with a blackout in the bridege.didn't get it up to loud but it does sound like a real amp and reacts like one too but it doesn't push and have the fullness. at least at the volumes i was using it at compared to my rm100 at thye same volume anyway.it seemed to be similar to other modeling stuff that i ve used before. stiff but very consistant in how it reacts. just lacked the tube punch if u know what i mean i guess. it did feel pretty good though pretty alive but not quite like a 5150 or something like that. i did notice that alot of the high gain stuff sounded similar but it wasn't mine and wasn't set up for my guitar or cab so that could be. i do have some experience with other modeling stuff and honestly i can't wait to check out the new line 6 hd stuff cause after hearing clips and playing the axe i think the hd might be perfect for me. the axe is nice and probably way more than i need but i like my randall better for live which is the majority of what i do.but agin i guess it not fair to say since i didn't have it up to gig volume or play it with a band. i got a hunch and doesn't exactly replicate a cranked tube amp in everyway. if u got the cash get one it sure seems nice and would keep anyone busy for years. the possibilities on it seem endless and it does sound pretty good