Has anyone used the Lenovo y480 with Ubuntu?

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http://askubuntu.com – I'm looking into a Laptop with good graphics capabilities for under $1000, and I came across the Lenovo y470p and y480. The y470p has an AMD graphics card which I'm told is supported better under Linux but is otherwise "last gen," while the y480 has a Nvidia 640m card but is much newer tech. I'd like to know what the state of Nvidia drivers are in Ubuntu and if this is an unsupported Optimus card or if it would be a good computer to use. If possible I would like to use Linux for everything, and the graphics would be a nice bonus but I am willing to keep Windows on the computer for the occas (HowTos)