Quoted from Frax:"that guy"?
You mean the one that wins because he knows when he needs to cut away distractions?
Okay.
I've found recently that headphones can be a mixed bag. Sometimes you miss audio cues that can tip you off to something bad happening before you can assess it visually, but at the same time, having music you can jam to and just lose yourself in the game can be a MASSIVE benefit occasionally. I had what was probably one of the most ridiculous come-back wins in local tournaments on a Transformers Pro after having two horrible balls, I put the headphones in, turned on the dance music, and just WAILED away at Optimus and Megatron and had a bunch of super jackpots and 3+ multiballs on ball three..
Biggest drawback to headphones is missing tilt warnings. Seen it happen to just about everybody that uses headphones.