They are constructed very much like the original studios - lots of hi gloss plastic, but they have an added feature that beats don't have and if did, would be crucified for having - there is a button on one if the earcups that if pressed activated LED lights that light up each frosted S logo on each cup which is powered off battery that runs the active n/c - which incidentally is about the same quality as beats n/c function - offers some noise reduction but not much.
The SL300WB's do run without the n/c function in use, unlike the beats, however the sound quality and volume is dramatically reduced IMO, so I'm guessing that they have an internal amp doing all the work here.
It's been a while since I used the SL's to be honest, so I don't really want to go into an in depth sound review off memory, but what I can say is these cans are very bling with a sound signature very similar to the original beats studio's - which makes sense as clearly this is what Ludacris and SOL were aiming them at.
I guess the ability to play without having to rely on the battery life is a plus, and these cans are generally good fun with a pronounced bass signature - likely aimed at the hip-hop crew out there