I have Vista Ultimate 100% free and I would buy them only if I was going to purchase a new pc with the cheap DSP version. My pc is actually good with Vista Rating 3,8. Anyway, I am using Vista since the Release Canditate 2 in November 2006 and I've seen that it is an amazing OS getting better and better fixing errors, bugs, incompartibillity etc. I would strongly recommend you to purchase it or download it (Microsoft became wealthier with 40.000.000 copies of Vista sold anyway). I would suggest you though to dual boot it with XP till the sp1 is released.