Who has tried it or are these pointless assumptions. Drivers for all products may not be released yet sure, worst ever and buggy no.
Driver support is limated because it's new technology make sure your hardware is supported before you build. As for buggy it works fine the only time it doesn't run 32 bit is when the installer has 16 bit components or if the program itself has some 16 bit components.
Article on XP x64