I have AKG's (K127). They're great, give a very nice and detailed sound. No doubt they're great for 'monitor'-work.
On the other hand, I noticed I listen less and less to music because of them. At first, I thought it was just because I didn't find any music worthwhile to listen anymore. While that certainly is the case to a certain extent, it has also to do with listening fatigue. Listening to this rich, detailed sound through headphones a whole day long, each day, easily gets tiring. For listening music on the background, they're not really suited -at least not for the whole day.