kyr01 - 9:53 am on Aug 24, 2003 (gmt 0)
I just made the transition from Freefind to Xav. I can tell you that it was rather easy to install the script, while configuring the results page to your needs may take a little more.
I don't really see it as a matter of costs, since Freefind is not expensive and Xav is also quite cheap. The *real* advantage in having your own engine is that you can properly configure it. Just to make an example, we had a fair number of searches for our competitors' names: freefind could only deliver a 'No result was found' page, while xav can now show a little box (technically it is an ad) every time a keyword of our choice is searched for (that box, obviously, has links to our own brand...).
I would strongly recommend the transition to your own engine in general and to Xav in particular (which you could also get for free if, as in my case, you contribute to translate it in a new language...).