As far as I'm aware, this machine doesn't have the hybrid graphics. Mine is Sandy Bridge with Intel HD 3000. This and the HD 4000 are very well supported on newer X/kernel. However they aren't as powerful as propreitary drivers. I'm not a gamer but I have tried a couple 3D games like Nexuiz and it ran absolutely perfect.

I'd also like to add: if you choose the 5500 series over the 6500 series, you can use the money you save to purchase a decent laptop bag. That will definitly protect against most build quality issues (not that there are glaring flaws on the 5500 series).

Take a look at dell outlet and bensbargains.net for a coupon code for a killer deal. Mine had one little paint smuge on the case and otherwise is perfect.