The hell that is a forceps delivery is one of the reasons why my DD is an only child. She was yanked into the world following a long back to back labour, after a Registrar tried and failed to manually rotate her whilst still in the birth canal. I was told that ventouse / forceps were pretty much the only option, as she was so low down and that they would be preferable to baby being pushed back into position to facilitate a C section. I was moved to theatre and the Consultant (who apparently had not delivered a baby in years) first attempted to get her out by Ventouse. After 3 attempts, he declared that he "thought he could get baby out" by means of short forceps.
Yes, DD was delivered safely but she had awful bruising to her head and screamed blue murder every time anybody touched her, particularly when we attempted to get her to latch on. She was prescribed Calpol at a day old "to help her to feed" - you can only imagine how wrong that felt on every level. Thankfully, she recovered well and is now a healthy and happy 7 year old.
I, on the other hand, continued to feel the effects of those hideous instruments for years. I had a 3rd degree extended episiotomy (which is a euphemism for "we cut you, but you tore anyway"), which developed a haematoma, which subsequently became infected. I was in agony for around 4 weeks, with a lower level of discomfort that went on for years. Long story short, I ended up being re-stitched when DD started school.
I'm not brave enough to have any more children, but if I did, I'd be booking my C section from day 1.