I've been on and off about having it on my profile. I did not notice any more or less success when it was there or not. I think it's more important just HOW you put it on your profile. When I had it, I used to first list 3-4 good things about me, then write "Honestly I just stutter to give the other guys a chance". If you are nervous about it and want the other person to know before a date, I think it's a good thing to include. Otherwise, it's probably not important.