CG-Referrer does similar tracking (and referrer-spam prevention, and bot bouncing, …), though a lot of the cool stuff is in my upcoming release and not the current public one… ??
Certainly, any system doing tracking will hit the database and take up space. Any system using logfiles will generally take time processing the files, take up a lot of memory, or build its own cached versions of the data. ?? Generally, if I have access to awstats or equivalent, I use it to see the pretty graphs. But I like my own tracking of bots, feed access, searches, etc., that my upcoming release does. That’s just me.
-d