Well, I'm not selling my Paradox or Alpha Dogs anytime soon if that's what you're wondering. When a headphone is well done I like it whether its neutral or not. If you check my YouTube channel you'll see me reviewing the Audeze XC and giving its a thumbs up and that's one of the more colored cans out there right now. What can I say, I like to let whats left of my hair down now and again an have a little fun. The HE-400 is an enjoyable can IMO. I got some Tragically Hip tunes playing right now and its sounding very nice.
I like your impressions. "Nuetral" is a tough one because as of right now, that definition may have shifted with some new products IMHO. I actually find the HE-400s to be quite well balanced for my ears right out of the box. I just can't resist a little more bass weight and some treble trimming when possible. But honestly, even with no EQ available, they are a damn good headphone.