A large number of blogs and other sites now use Feedburner as it has a number of great Pro freatures and Feedburner also allows you to transfer feed ownership between users. Whilst you can see your stats in Feedburner the graphs are not that great and you can compare them.
There is a site called Feed Compare that allows you to view the RSS subscriber data for up to 4 feeds on a single graph. This means you could compare your competitors RSS subscriber count with your own feed.
To allow you to get a better idea of subscriber numbers you can also view a graph showing data for the last month, quarter, half year, year or 2 years assuming the feed has been in existence for that long.
The reason this is such a great tool is that you can now find out exactly how a sites RSS feed has grown over time. All you need is the sites Feedburner URL which you can get by right clicking on the sites RSS feed icon and copying the URL than pasting it into Feed Compare.
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