I've spent a lot of time the past few days trying different tracking solutions. I have been using AWstats, but want to be able to track which exit links are clicked. I've been trying to find out which PPC ads result in a click through to the merchant. I can already tell which adWords were clicked, but at the merchant it only shows as a number of incoming clicks.

Well the latest try is with mROI from ModernInsider and as usual I learn more about it after install. I was hoping to find something based solely on my server and thought this was it. Now I see it uses tracking links for monitoring like
<a href="http://www.moderninsider.com/mroi"><img src="http://www.mydomain.com/mroiclick.cgi" width="1" height="1" border="0" alt="mROI tracking" /></a>
The question is does anyone know if this can be trusted. The Free set up is looking good so far.