Just got mine today...I'm not going to be able to compare them to other 6 Series headphones or anything, but what I can say is that these may officially be my favorites and cause me to sell some stuff in the near future. I'll put it this way, it's like somebody took the "fun" from my X2 and tossed it into a much more mature and complete sounding headphone. The 58x isn't as wide and doesn't do the "left to right" spacial thing, so I dunno how it would work for gaming, but holy crap is it ever precise and very very very "3D" sounding with some big depth to it. Man does it ever sound good with music...very lively, very energetic and fast, but yet there's a ton of clarity and a very natural type of feel to it. If I had to think of a word to describe this thing, it'd be "percussive"...drums just have such impact while still sounding as they should and not getting boomy or lost. It definitely is a kind of weird mix of being revealing and detailed yet very fun and a total toe tapper. The odd thing is that I have a Momentum 2.0, and the character is very similar in a lot of ways despite being apples to oranges. Guess this is probably the answer to anybody who feels that their 6 Series headphone is good but maybe a little too boring?
Very easy to drive too...no issues to speak of with just a Q1.