I'm on the fence these days about Pro cards, but not about this class of pro card. They're very much not worth the money on the low-end, and diminishing returns as you approach the high-end. The Quadro 6K costs roughly half its namesake, and for what? An underclocked gaming card GPU with more RAM. Why not just make RAM modular and let us add our own?
Jecastej, I've heard similar remarks from a few people (BoostAbuse, a few other professionals in the industry) about the pro cards, but have yet to see one outperform a Geforce with the overrides enabled, in the Nvidia control panel. I've clocked most of them with Everest now, as well. Nvidia doesn't have drivers for special apps, however - you're just plain wrong there. They don't have drivers for Maya specifically, nor for Rhino, Mudbox, Silo, etc. They may have driver profiles, but that's not the same thing. Those are just override profiles you can access already in nvcpl.
The problem is that it's simply hardware locking from the driver end. The Quadros sport the exact same chips as the Geforces - but you pay the premium for better QC and also for professional-grade support and replacement should one fail. So it's justifiable if your product fails or you have problems, sure.
Maya is such a specialized app and with so many, many variables and issues with the application itself (it's my bread and butter), it's almost impossible to actually diagnose how a card will perform unless you use it, tweak it, try various drivers (the Microsoft-suggested or Nvidia-suggested or Autodesk-suggested ones are never, ever the best ones; it's always the slightly older ones).
I'm pushing 20M polys at 15fps with a GTS250 in Maya, and almost twice that with a GTX460. There's simply no reason to purchase a FireGL or Quadro at this price point for Maya. I spent a year chugging along on a 380FX and it was just pathetic; the GTS250 demolished it and was an excellent replacement, even if it is just a retooled 8800GT.