Hi Thf,
let me state it simply - yes.
I've owned McCormack gear in various forms for almost a decade and went from a stock DNA-1 through the upgrade cycles to Steve's most recent mods. My most recent DNA-1 mod was driving original Mirage M1's and while they sounded fabulous, I felt they needed more power to bring them alive and auditioned the DNA-2 LAE and finally, the DNA-500.
Well, I kept the DNA-500 - end of that story.
I have heard alot of very fine and very expensive SS amps mated with similar quality preamps, speakers, etc. Every time, I have been drawn back to Steve's sound and felt very fortunate for the modest sum it cost me to own it.
The final plus is, Steve eventually gets around to offering mods to all of his gear and, if you can afford his pinnacle upgrades, your in the elite end of high end audio - at a still modest sum. No doubt you can find better but believe me, you will spend alot more before you do - IMHO.
If your fortunate enough to live in an area with some good audio dealers, you should be able to bring one home and audition it over a weekend. If it's a floor model, that's better because it's well broken in so you can at least hear the DNA-500's potential. I find home auditions the true critical test because nobody else provides your combination of components and room accoustics.
I wish you the very best in your search.