There are many reasons to have a really good set of monitoring headphones in the studio - we may need to work quietly because of noise constraints or perhaps we don't want to listen to the same set of speakers all day.

I've had a little over a week, I've owned the Sony HD-7509 (to be avoided) and the 7506 is a good headphone price / quality ratio, I always use it for decision sounds, the K712 is open. I got this headphone at a great price on a Belgian site, cheaper than its German counterpart.