I only have 4Gig but gaming experience for me its the best so far, it meets my requirement therefore I won't upgrade to 8Gig. Too be honest I prefer the overall feeling of the y500 than playing on my friend's Razer Blade, call me weird but its true.

My palm doesn't feel much heat (Blade have a focus heat spot, which annoys me) and jumping from keys to keys is pretty at ease (hardly pushed the wrong key)

I brought my machine to chill out at a nearby Starbucks, last about 2 hrs 45 mins with continuous gaming (DOTA2, GW2 in max setting, battery 'high performance' profile.

and 1 more thing, it make head turns! 

I will still pick the y500. 

Although both y500 and mac keyboards looks the same, the reason is because y500 keys are curved into the middle (if you look carefully at the pics) that fits in perfectly to your fingers during compression while mac keys are flat so it kinda feel a bit rigid and dull.