Well, mine (actually a not so new Bose pair) have great sound quality, much netter than any other headphones I have. Plus they cancelled sound and the "wrap-around" quality of te speakers adds some intense bass if that's what you're looking for.
I use mine for virtually everything, watching tv on my phone, using the computer, etc.
But they usually cost upwards of $100 for a cheap pair, so it is a sizeable investment.
From what metal I've heard on my Bose, yeah i'd say the sound is much improved.