You can get some information from your log files, but the interface on the "store bought" is more pleasant to use and the information you can collect is remarkable.
Timothy Warnock works for a company that sells one.
www.clickalyzer.com is more than an ad tracker.
As far as complaints, they are varied and he's trying to work things out with people right now. I don't get the impression that he's dishonest, but maybe a bit of a poor manager.
Peter Stone