IE 10 is working fine for me. I am using Windows 7. I still am not sure if I will go to Windows 8. But if you are using Windows 8 and want security use the tiled version of IE 10. It does not support some of the stuff that can get you in trouble, like Java. And Flash is supported only for certain white-listed websites. You can also turn off Java and Flash in the regular IE 10. And you can use InPrivate web browsing.
And if you are ever really concerned with possible security issues at a website, but need to go there for some reason, in Windows 8 you could use the tiled version of IE 10 and use the Guest Account. Everything gets deleted once you log out.
What I wish Microsoft would do is come up with an upgrade for Windows 7 and include many of the security features in Windows 8. Because I like a lot of the Windows 8 security features but I think Windows 7 is just fine.
To me Windows 8 is better for a tablet than a desktop computer.