Aside from political issues surrounding open vs. closed-source (graphics) drivers on Linux, the proprietary NVIDIA Linux driver is widely liked. The proprietary NVIDIA Linux driver is relatively bug/trouble-free, has a performance parity to the Windows driver, supports new hardware right away, and has a near feature parity to the Windows driver. There’s not much more you could ask for from a closed-source driver, aside from a few missing features. One of the missing features that’s been widely talked about as of late has been Optimus.
NVIDIA’s Optimus Technology is currently a notebook technology designed to extend the battery life of the device while still delivering an optimal graphics experience. Optimus works by automatic switching of notebook GPUs: between a low-end low-power IGP and a high-performance GPU. This is dependent upon the needed graphics resources and power source. Switching is done seamlessly and transparently.