I now have both versions. The "Home" on the notebook and the "Professional" on the desktop and have to clearly say one thing: never, never, never should voluntarily resort to "Home". There is sometimes still ehebliche compatibility problems do not even quite as old XP programs under Win7 (eg. Through many CS1 to CS3 versions of Adobe outrageously expensive series not under Win7). In the Professional version that does not matter - because the system automatically changes to the compatibility mode. That you get not at all with the User. See "Home" on the other hand simply do not work the programs. With luck and trickery can perhaps still install but then freeze in operation often minutes or topple completely. That is why my clear warning of Win7 Home! Who wants to worry switches, must rely on "Professional", otherwise you only makes trouble! (There are circulating on the Internet the way en masse tricks you supposedly can also unlock the "Home" Compatibility Mode Forget it.! That's all just messing)
Very briefly even to overall performance: Anyone who owns a computer on which XP was afloat, will also come with Win7 cope. For the really nice features (like transparant Aero interface) but you should already have at least a 2 GHz processor, a decent graphics card and 2GB of RAM. Since I run 4 GB RAM in desktop, I have resorted to the 64bit version.
And now, a word to those who are fearful of change and are not sure whether they should dare: Makes it easy! Win7 comes one in the first days before terribly different. But that is very, very fast. At first, you feel as XP users, the system still patronized before, but there is no comparison to this "Are you sure?" - Orgies that existed in Vista. I drive Win7 now for four months and have to say: The change has paid off. Microsoft is there really a fine OS succeeded.
But as I said: This is all for the Professional version. From the "Home" you should really stay away!