There is no single answer that fit's everyone's situation. It depends a lot on how your use your laptop and where you browse.
So why not install it and test it out to see if it works better for you.
If you want to roll back to IE7 it's easy to do that. When you remove Internet Explorer 8, your earlier version of IE is restored with your customizations (such as add-ins, Favorites, and your home page).
Go through Start and into Control Panel. Under Programs, click Uninstall a program.
In the tasks pane, click Turn Windows features on/off. In the list of features, clear the check box next to Internet Explorer 8.
You receive a warning message in a pop-up window. Click Yes and IE 8 will be uninstalled after the next reboot.