I upgraded to Windows 10 yesterday and I find it better then Windows 8 mainly due to the start button they have given back in Windows 10. System does not respond any quicker or slower if that is what you are wondering about.
I must add that this upgrade was the best ever because I did not have to configure anything atall as all the apps were reinstalled automatically and I got a fully functional system at the end of the upgrade. You would need to make sure your hardware is compatible before you attempt to upgrade.
When you receive an alert for the Windows 10 update accept it. After some time around 2-3 weeks later you will receive a notification that your device is ready for the update. Simply follow the prompts after you have clicked on the notification.