Check out the video that Lasse did. It's quite obvious that you can profile a recording chain to the point where it doesn't matter in the mix. The SPDIF reamping, where you don't lose ANY sonic quality, is also gold. If you can't get it close enough you're more than likely doing it wrong. I've read that it doesn't work as well on some type of amp designs, but everything I've done so far has been close enough that it doesn't make a difference to me, and the workflow is so much better than tracking through a real amp. I'm flying out to a gig on Friday, and I'm bringing my new Rev F Dual Recto(serial number 9xx) with me which I profiled two weeks ago. Oh, I don't own the amp, I just borrowed it