Pros: extermely comfy, good response to music "more detial"
Cons: 55ohms ;(
Yes first set of quality headphones, the sound just keeps getting better and better, burn in went nicely, responses to bass better every time I use them,
Only problem I have with is that the low resistance (55ohms) and my big amp don't like the low end at high volumes, they defiantly go loud enough to do some damage with little distortion in the left speaker with bass overall very pleased :) next set is going to be the AKG 702's :)
I had the choice between discounted M-audio Q40's and these I chose these for the pure over better sound and comfort vs Q40's nice kick in low end but they where very tight on my skull/ears thus only wore the for about 30minutes or so with my ears bloodshot and hot as the Akgs I can wear for hours on end without an issue also had chance to test them out before I bought anything sat in the store with nice powered amp couple CD's weighting out the cons/pros of each set
Well only real difference apparently is the rating (55ohms vs 600ohms) I think the 600 are more suited for actual studio work, working much more powerful amps/desks so they can pushed higher for louder volume to see how it sounds at that sort of volume (check for distortion and impurities), also I think the quality is about the same, AKG made these to replace the 600 version, but as for real-world applications home use..etc the 55ohms version is better for low-powered devices (ipods, cellphones, mp3's, crappy pc sound cards (lol) etc..), also IIRC, the 600 studios have been discontinued, this is what managed to found just did bit of research, but either way I recommend any "audiophile/studio-phile" headphones be powered by a decent amp, which drastically increases your overall enjoyment of the headset and making it much more worth the cash.