I just saw the price on these and I am for the first time considering owning two headphones at once. Its hard to get a feel for how bassy these cans are, however. I own the Pro 900s, and while I can recognize they emphasize bass, I find their bass quantity near perfect for my tastes. If these are similar (and I hope somebody can comment) I will be ordering them instantly.
Maybe you should just order them so we can find out!
I'm a bit curious about these. If you did happen to get them, I'll be expecting some comparing against the Pro 900.