I've always liked Dan, too, he's a great guy and quite the character (at a post-NY-meet dinner a few years, he was regaling us with some great Burning Man stories).
I think he makes very good products, and tries hard to keep improving. And while this causes issues with older gear losing value, I do not put him in the same category as HiFi-Man, which seem to rush out lesser quality products, only to introduce rev 2's shortly thereafter to fix the issues (and again greatly devalue the first series).
I heard Dan's prototype Stat's at a NY meet, one driven by a BHSE, one by a Cavalli amp. The Cavalli amp one sounded horrendous; closed-in, limited in frequency response, just kind of lifeless. I discounted this, well because Cavalli. The BHSE-driven phones sounded more promising, but it took a high turn of the volume to get it going.
I'll leave it to those who know the most to critique the products....but I DO like and respect the man, too. And Purk, if he can compete with the Stax phones, especially without going all proprietary, I'm all for that!