Wow, that is so weird. I responded to the same thread when Jim offered the discount on the Guttenberg unit. Though, when I look back at my emails with Jim, while I did ask for the Guttenburg unit, he never came right out and said that's the one he was sending me. So it's entirely possible I got something else. I assumed the one I received was the review unit, though. Because, 1) I got the $500 discount and 2) when the Amp arrived, the tubes were already installed and a screw on the back plate was not tightened all the way, as if someone had opened it up, looked inside and didn't tighten all the screws back up. So, it seemed "used" to me. Also the box it came in had been taped closed, reopened and retaped.
I guess it doesn't matter. The main reason I mentioned that I had the review unit was just to make sure folks had all the info when making diagnosis/comparisons and offer up one reason why my unit may have some differences.
Now you have me even more worried that I have a ticking time bomb in my bias meter!