If you are serious about making your site a success - particularly if you charge for your services - install this! I've found the month summary view is an invaluable snapshot that you can use to tie in with your sign-ups/conversions from google or whoever to get quick and easy reporting on whether your marketing campaigns really are working or not

This is an excellent piece of kit!
You need to swap a couple of the standard joomla items for mambocharge's own - but it comes with plenty of clear instructions, their site has a good support forum and the component itself gives you such a degree of control over your content & services and the ways in which you can make money from them that it is more than worth the effort - Recommended!