Hmm... it's not something I'd like to hear from a therapist either way I don't think (and so far I haven't). I'm not interested in whether they've had clients with my issues before, I'd rather be treated as an individual regardless. I don't want to be made to feel that I'm a freak, nor do I want to hear that my s**t is just the same s**t as everyone else (though I'm sure much of it is).
Perhaps there is also a part of me that wants to be different, that wants to shock them. That wants to be special...
In fact, definitely there is a part of me like that.