Microsoft works 105 versus Microsoft Office

So I bought this new PC with default installed software program called Microsoft Works 105. It works just fine and I don’t have any problem with it. However, I know that there exists application somewhere out there called Microsoft Office which is the professional counterpart of Microsoft works. I would like to get your opinion regarding this if this is worth spending for. I am just an ordinary average home user of personal computer. Do you think it is worth leaving MS works for MS Office 2010? How much would it cost me to use it? Ideas please.
