I've had many many pairs of headphones; closed cup/open cup, with/without noise cancelling, and most brands out there. Beats Studio are easily the worst for sound quality.
The good points first: I actually like the look. They're a bit ostentatious but they feel like good quality hardware, solid and plush. The box presentation is nice. Also I love the design of the cable jack - it is at a flat right angle so it sits flush against whatever you plug it into. This means there aren't any awkward angles to snag the jack on in your pocket or wherever. It's about time other brands caught on. I'm looking at you, Bose.
But all that is secondary. You buy headphones for the sound and the sound of these things is just appalling. The most important point I want to make is this: powerful bass is not the same thing as good quality bass. The Beats Studio have powerful bass, but it is muddy and unrestrained, the opposite of the crisp notes than come out of a bass guitar. It's like a pair of blown speakers strapped to your head. And because the bass is so powerful it overwhelms every other element of the music. The mids are acceptable, but you can't hear them. The highs are below average quality for a price tag like that, but don't let that bother you because they're totally obscured by the bass. You can't hear any detail at either end.
Aside from the sound quality, they leak noise like crazy. These things are closed cup, active noise cancelling so you shouldn't be able to hear anything if someone else is wearing them, but you can hear every note. Also I wore mine on a flight and the noise cancelling didn't block out any sound at all.
Mine sounded so bad I was worried I'd bought a fake pair, so I took them back to the shop and they replaced them with a brand new pair. Exactly the same. The lady in the shop told me they get refund claims many times more than other headphones brands.
The Beats Studio will sound good if the only other kind of headphone you've tried is the in-the-ear, ipod variety. They'll also sound passable if the music coming through them is fairly simple. But if you shop around you'll find a much higher quality sound at half the price.