My opinion - not unless you have a need.
Check these out.
MS Vista – Pros and Cons
http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=272182
AIM
http://www.aim.com/help_faq/starting_out/getstarted.adp?aolp=
Can your computer be upgraded to Vista?
Whether your PC can be updated depends on when you purchased your computer.
Here are some general rules of thumb to get you started.
If your PC was purchased between Oct. 26, 2006 and Mar. 15, 2007 then you are eligible for the FREE Express Upgrade to Windows Vista.**
If your PC isn't "Windows Vista Capable*" use the Microsoft Windows Vista Upgrade Advisor to get a recommendation for the edition of Windows Vista that is right for you.
If your PC is more than 1 year old - check first with the Microsoft Windows Vista Advisor Tool.
The Windows Vista Upgrade Advisor will help you to determine if your Windows XP-based PC can run Windows Vista.
Microsoft Windows Vista Advisor Tool
http://www.microsoft.com/windows/products/windowsvista/buyorupgrade/upgradeadvisor.mspx
Link to Vista versions and their capabilities: http://hpshopping.edgesuite.net/www.shopping.hp.com/shopping/html/popup/vista_features.html?aoid=39158
Compatibility with older programs
There is no trouble loading earlier versions of MS Office such as Office 2003 on computers running the Vista operating system.
On the downside, there are vexing compatibility issues because Microsoft added so many bells and whistles to Office 2007 that they can be contained only in a new file type such as .docx in Word.
Unfortunately, .docx files cannot be read by the earlier versions of Office, so Microsoft offers a compatibility pack that can be downloaded to let Office 2000/XP/2003 view Office 2007 documents but with a number of features of 2007 absent.
Go to www.support.microsoft.com and use the search term “Office 2007 compatibility.”
Source: jcoates@ tribune.com (a writer for the Chicago Tribune)