As a proud owner of a set of Audio Technica AD900s, I will HAPPILY support anything AT.
Buy with confidence. Not only are these one of the best of the best brands out there, this model is one of the most tried and true of their line, one of the most highly regarded, and a favorite of almost anybody in the know. They are not the most expensive headphones in the world, but they are considered by almost ALL to be one of the best VALUES on the market, and as has been mentioned these are are a significantly lower price point than new, already broken in (Which takes hundreds of hours of listening, and something all high end headphones need) and has a VERY popular mod already added to it.
If you have not done research into what sort of headphones you should be wearing, and have not already made an educated purchase. THEN YOU NEED TO PURCHASE THESE IMMEDIATELY AND DO THE RESEARCH LATER.