The only research I read that pointed to any benefits said there was only benefits for first time vaginal births basically. And even then, it's a reduction in the chance of tearing, not a guarantee. This is my first baby though, so according to that research it could be worth a shot. Doctors in my area are very episiotomy-happy, especially for first births, so I've told my doctor under no circumstances do I want an episiotomy as a routine procedure and I'll try perineal massage as the compromise basically.