I've used it once or twice, the first time i was foolish enough to even let the guy get the password to my account, but i had little to no gear though, even still, it actually went well. I switched password after a few days of wisening up, lol.
Second time went well too, they make the character in an account of your choosing, then you get the password to that account. It worked well for me.
But of course.. use a familiar name, not any random. Start small, test people out, let them do small services before investing big.