The Monster headsets tend to be very bass-heavy and, to my ears, it's to the detriment of the rest of the frequency spectrum. I wouldn't call them great-sounding, particularly for the money. I'm not a real fan of the various Bose QC's SQ I've tried over the years, though I haven't sampled the latest QC15 so I can't speak on those. But between what Bose models I have tried if I had to choose between the two I'd take the Bose. Personally, I'd take the SQ of the Audio-Technica ATH-ANC7 (which I did since I own a pair of these) and the significant cost savings in doing so.
I am looking to purchase some new over the ear headphones and am debating between monster beats and bose quiet comfort 3s. I think I am a bigger fan of the quiet comfort but my only concern is the cable is just going to continually break and the beats are more fashionable which is not a big concern but it's something you have to think about when spending so much on headphones. Is there any help you ca give to decide between the w pairs of headphones? I would greatly appreciate any help with this.