Guidocorona,
I actually had a chance to look at the APJ you are referring to and the quote needs a couple of footnotes.
One is that Shane Buettner is the one who did the reviews of the ARC and Callisto, not Hardesty. Not sure if Hardesty had a chance to hear these units or not. Also, I believe Mr. Buettner was comparing these two units to his owbn VTL 7.5; I am not sure it was an upgraded MKII unit.
Small details, but I figured since I'd had a chance to look at it I'd let everyone know.
Cheers,
Jonas