I’ve tried 6XX, Sundara and settled on Anandas for endgame. I find that they are better in every way to the 6XX except for that magic midrange. If I could transplant the warm luscious mids into the Anandas I would never consider buying another pair of cans. I guess that’s the price you pay for better resolution and soundstage.

It's mostly because they have good extension on both the low and high end, and low distortion overall. So if you get a pair that works (buy Open-Box), you can basically mold them into just about anything you want.