My dad recently purchased a laptop running Windows 8 and, while I've heard quite a few complaints from people that have upgraded from Windows 7... I think it still makes sense to have the latest operating system on your machine.
Over time, Windows 8 will provide several benefits:
It'll be less buggy & provide better security and support.
From now on, apps and add-ons will be designed for the newer operating system.
If you have a Windows phone, then Windows 8 is deigned to better integrate with your device.
The only reasons I could think of for holding back from upgrading to Windows 8 are:
If a program or app you use on a daily basis (especially for work) isn't supported by Windows 8.
If the pain of making the transition and re-familiarizing yourself with Windows is too daunting.