We did that one time. On the one had it worked very well. The person wasn't a good fit on the team so we declined. On the other hand it was emotionally draining because the guy was a really nice guy. It's really, really hard to work with someone, get to know them a bit and then at the end say, "Sorry, you're just not for us". I think it was even harder for the candidate who didn't clue in that they weren't doing very well. They met the team, got to know people a bit, got to feel the atmosphere and started to imagine what it would be like to work with us.

In the end it was such an upsetting experience for everybody that we agreed never to do it again. I think there are probably ways to make it work, but you need to be really careful to maintain some distance... But then, will you get the result you are looking for if you do?