Performance wise, there are gains in Windows 8. Compatibility with older games, not so much (but it has improved since launch). Also, I keep seeing more driver related issues with Windows 8 than Windows 7 due to the maturity of the drivers, I guess.
The only other thing is that you might get Windows 10 free when released, if you are interested in that.
Personally, none of the pro arguments above would move me to get Windows 8 on a new machine, however.
Last edited by Bib4Tuna; 10/02/14 04:31 PM.