From an industrial design standpoint, the designs are similar. I mean, put some Beyerdynamics or Sennheiser next to those and see how different they are.
I used to do business in China. You go to the factory and they ask you what you want to knock off, or at least show you prototypes they have already made very similar to popular brands (even if they don't directly mention that). If they already made it, or make it for someone else, then they'll happily dust off some plans and make a near copy with different parts.
That said, I've tried the Beats by Dre, and I'm not just trying to jump on the band-wagon...but they were the most painfully terrible headphone I have heard in a long time. I mean, terrible. It's no exaggeration. Just go for the listen. Yes, there is lots of bass, but the treble is so harsh that I doubt anyone with half a brain will want to have them on for a full song. Seriously, go for a listen, it's that bad.