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IF page views and bounce rates are important metrics. This search box will hurt it..
I have not seen an instance were it opens up in the site you searching.
I've had it running for a while now. Not many visitors seem to be using the search box though
IF people use it, they immediately end up on my site (then it's up to me to make sure I'm giving them what they are looking for).
The search is going to my site as well. Not where I want it to go yet, but it's definitely not on Google. Still tweaking.