FeedBurner

Does anyone out there use FeedBurner for their blogs? 

I signed up awhile ago and never really did much with it, but I feel like I didn't configure something correctly.  The stats and subscribers seem way lower than I think is true and I feel like my blog feeds didn't transfer over properly. 

Any suggestions for what I can do?  The "help" features didn't really help me at all since it seems like I did everything right.

And what is the purpose of FeedBurner?  What makes it better than just posting through Blogger and using a stats tracker for numbers?  I am failing to see the benefit but I know that a lot of people think it's a good thing, so I feel like I must just be missing something.

Help! Please!