I like Windows 7 a lot! I'm currently running triple boots on 2 of my computers and single boot on 1 computer. My first computer is a Intel P4 3.06GHz HT with 533MHz FSB, Nvidia 6600GT, 2GB RAM, 2 37GB WD Raptar 10K HDDs, 2 WD 320GB EIDE HDDs, 500w PSU, with a triple boot OS of Win XP Pro, Vista Ultimate, and 7 Ultimate. My second computer is a Intel P4 3.4GHz HT with 800MHz FSB, 4GB RAM, Radeon HD 3850 AGP, 2 WD Caviar Black 1TB, 2 WD 500GB EIDE Caviar Blue HDDs, Antec 650w PSU, with a triple boot OS of Win XP Pro, Vista Ultimate, and 7 Ultimate. My third computer is Intel i7 920, 6GB G Skill Trident CAS6 RAM, Geforce 250 GTS 1GB, 2 Samsung Spinpoint F3 1TB, 2 WD Caviar Black 1TB, Corsair HX1000w PSU, with windows 7 only. My oldest computer wont run Windows Vista very well, the OS is crap, but it does run Windows 7 just fine. On the second oldest computer I never run Windows XP or Vista, I don't need Windows XP anymore, and I hate Windows Vista. So basically I'm going to format my old PCs and just use Windows 7 on all three of my computers. BTW, my old computer was built in 2003 and it has no problem running Windows 7 Ultimate! Windows 7 is a great upgrade for even the older computers! Oh and I even run full OS graphics with Aero and all with even my oldest computer.