To start, the customer service(email exchange with Matthew) was top notch. Provided all the information for how not only the HD800s would sound on both my setups(Gustard H/X16 stack and Chord Mojo 2) and he was right. Sound great on both and both drive the HD800s perfectly.
The headphones are amazing. The reviews were right, the soundstage and precision of the positioning and imaging is amazing. Some say the bass was lacking but the bass to me was punchy and if anything, just the right amount and natural(I have 15 headphones/IEMS. To me at least. I was shy to buy these but very glad I did. Great for all the music I listen to and makes games so much more immersive and soon school( Full Sail audio production). I was using DT1990s and DT700 but now I don't know if will get these off my head. The HD800s with the Symphonium Helios for something more isolated and on the go is a combo I'm in love with.