A lot of people use Google but I like
www.master.com and have been using them long before Google came along.
I think Google is probably easier to setup but I like to fully customize my results page so it looks like it's on my site. Google's search results looks too much like their site. Or maybe the sites I've seen with Google search just haven't customized their results pages. Can you even do that with Google search? Not sure. Maybe someone who uses them can answer.
Here's Google's
http://www.google.com/sitesearch?utm...tm_campaign=en