Which is what? It's just anecdotal but most of the people I know with Pros got it as a high end development workstation, building iOS apps, etc. Final Cut Pro is pretty much the only app that benefits from the dual GPUs, and even then the gain is relatively marginal over a machine four years old. And that's paying for very high priced "workstation" GPUs (I called them compute cards because that is what they are geared for, though as with all compute cards they are derivatives of GPUs. They're really price ineffective as GPUs), when you can get almost all of the same advantages on a basic ATI card for a couple hundred dollars.
Virtually every review of the Pro seems to be giving it a very soft glove approach for some reason. It is an enormously expensive monument to the dual compute GPU, for marginal gains in most apps.