I'm afraid I have to disagree with Niks and add that in my (very humble) opinion, it is worth upgrading from Vista Home Preium to Windows 7 Home Premium, because not only is it a far leaner OS but the search facility is sooooooooo much quicker than on any previous version of Windows! Instead of sitting there waiting ages for the search results to come up and then maybe having to do an advanced search because the search didn't show any results, as was so often the case on Win 98, XP Pro and Vista Home Premium, in Windows 7, you simply type your search words into the search box at the start menu - and dozens of results appear almost instantaneously! And on the very rare occasion when you don't find what you are searching for immediately and you click on "more search results" the search page opens immediately and so far, I have always found the file I wanted! So for that alone, I feel that the measly £64 that I paid for the Retail version of Windows 7 from Amazon UK (which comes with two separate discs for the 32-bit and the 64-bit versions!) was well worth the investment - particularly as it also allowed me to upgrade my OS to a 64-bit one!!!
Yes, after a little bit of tinkering to get Windows 7 just the way I like it, I think it is the best version of Windows that Microsoft has ever produced and I would have no hesitation at all in recommending it to anyone!