I haven't tried it, I'm just desperate to get UTD now!
I've heard varying reports of sucess, a girl that I know of tried it to have a boy, she now has 3 girls!
Are you charting or using OPK's? From my understanding of it, up you would be best to start BD 3-4 days before you expect to OV.
Good luck, sorry cant be more help but Im sure there is someone here that can help