Closed headphones so yes, they block sound well. I tested it on full volume at night when shit is quiet and asked my brother if he could hear the audio. He said he can 'barely' hear the sound when I'm wearing it but he can hear it very clearly when I remove the headphones. Audio doesn't bleed when listening at around 75% volume level though, so I like that.
They're stereo headphones though and not surround. IF you want surround, you're looking for HS1 and not HS1A, though HS1 are not on sale anymore. Oh and they're not wireless but the wire is fairly long (3 meters) than other headphones so the movement shouldn't be a problem.
I can't say how well they are compared to Sony's 7.1 wireless set but compared to other Sony headsets in the market, these are light years ahead. Bass is not that booming but it's definitely better than the DJ-style Sony headphones and iPhone Sony earphones that I own. Hope that helps. Look for reviews elsewhere before you make a purchase, but yeah; they're very very hard to beat for the price!