i dont know about the others but i own the v55, initially its good, however not recommended for prolong use and i dont have a large head.. get to hot. for a rock, hip pop, rnb lover its great for it price but not enough. It get distorted when i use fiio e11 with it on ceertain songs..
Recently brought a fiio x3, waiting for it to arrived.. Thinking to pull my trigger on a new headphone, maybe the new hype of Jvc S500, or higher tier, sony MdR-1R, Denon hp700 or es700.... im lost....