I have to agree with others here. It's better to use Wix as a thin layer on top of Windows Installer but the documentation is very, very poor.
I spent a week of trial and error to create an installer just to find out that I had several installations of my app because of some misconfigured xml document from testing. A nightmare to uninstall to say the least.
I highly recommend to test your installers inside a VM or you'll screw up your system.
Also good luck if you want custom behaviour from the installer. The documentation for that is far worse than it is for the standard msi installer.
In last september I bought Lenovo IdeaPad Slim 3 without any OS preinstalled for around $100 less than the exactly same model with Windows.