Denon3910 Exemplar 2008 same as 2006?

I've owned mine for two years, now. e-mailed Mr. Exemplar (John Tucker). He's [usually] a tad slow in returning emails. May have to call. But I was wondering if anyone knows if he has been tweaking his original 3910? Any upgrades? I know Alex, the APL man, is always working on improving his stuff. Just wondering if there is any Exemplar 3910 owners, like me, who have had their originals upgraded by John, and if so?--Your sonic impressions. thanks