I've used feedburner for my feeds , all I can say that since Google made the PRO tools free , everything is working out just great . I love Feedburner because I can always know how many people are actually reading my blog via RSS
I've heard a lot about the PRO tools, but I am yet to try them out. As Blogging Finger's readership grows I'll definitely give them a go. I used Feedburner on my old blogspot blog, but most blogspot bloggers don't seem to be taking advantage of it...
I love feedburner too. I think that pro tools are a must, so are feedflare --- even if you prefer not to display the book marks on your site --- do it on your feed. Why?
It is common practice for sites to use other blogger's feed on their sites. If you add attribution and bookmarking functionality to the feed posts themselves, then you make sure your post gets credited to the right source.
I think that feedburner podcast burner is a must too for those who have a podcast --- even if it is only through a 3rd party website like talkr. Feedburner will help you correct all the missing info in your original xml file --- so that you can submit the correct info to sites like Itunes.
I like having the ability to find what works as far as posts are concerned and see the stats happening in real time.
I think google (who owns feedburner) rocks as a company , period.