Well, there is a difference between eventual target and current reality.
As a sysadmin it is a joy to use linux on the desktop when maintaining linux servers.
NVIDIA is way beyond any other party in their linux support. ( equal in performance and features to their windows drivers )
It's simply the best you can get right now. Now many of our coders use linux as well. But i don't think any of them would consider running the open source drivers.
As much as i would love my drivers to be open source i get much better results using the binary drivers.
That being said, i do applaud major vendors building their open source drivers themselves.
It is a major requirement to getting decent video card drivers for the future.