The Y500 with the GT750 SLI will be faster in games that support SLI. Battery lif will be worst. about 2 hours while playing games with 2 GPU, you can pop the 2nd GPU out with a DVD-RW. The Y500 cannot use the HD4000 intel to save power.
If you can live with the issues about get the Y500, I like mine.
ty for the battery info, that does kind of suck for the occasional need to use on battery, but i dont think it's an issue for me so much because 90% of the time this will be plugged in, and when i do occasionally need to go mobile it wont be for gaming.