It's a long time since I weighed in with anything much on this site, but I'll contibute my experience of Gungnir.
Fro many reasons, from liking the company itself, through having exactly the right inputs and outputs, to having the offer of a used Gungnir+2nd-gen-USB at a price that was almost generous, that I wanted to like the thing. No... it goes further than wanting to like it: I swept aside the seller's assurance of no obligation, keep it a while and see if you like it. OK, I didn't force the cash on him that very day, but I was convinced that I was going to buy it.
I didn't like it. I'm not the only person to have found it "shouty." Somehow, it has dynamics that feel, sometimes, like being punched in the ear. The peaks, in some rock vocals, were actually painful.
So, I gave it a hug and a kiss, told it was beautiful, and it was just me, and hey, I couldn't be more sorry things didn't work out... and sent it home.
Hey ho... I think it is fine for many people. I think it is great for many people --- they really love it. But I didn't, and, because of the specific nature of its sound, I would advise against buying it blind.
By The Way... I listen mostly with headphones, these days, HD600s. Through speakers, I found it much easier to live with --- but that was not what I was buying it for, so it didn't matter.
I didn't think I'd actually be happy to go back to the ODAC, but I was.
Actually, these days, I'm listening to a borrowed Geek Out 450. I have not taken the trouble to actually AB it with the ODAC, but neither, in any way, actually hurt my ears.