Has anyone ever had a doula for the birth (and post partum)? I think they sound like a fantastic idea. I'm completely intent on having a completely natural childbirth with as little medical intervention as possible but I feel i'm going to be lacking the kind of support I need from my partner at this time.
For those who don't know what a doula here is the best description I found:

A doula is a professional who provides emotional, informational, physical, and practical support for the expectant, laboring, or postpartum mother. A birth doula specializes in supporting the mother during labor.

Dozens of research studies have conclusively shown that birth doulas not only help the mother emotionally, but also increase the chance of her having a healthier birth and newborn.

Just what has research shown? When you have a doula at the birth . . .

Your risk of having a cesarean section, forceps delivery, or episiotomy drops.
Your ability to cope with the pain improves, decreasing the possibility of needing pain medication.
Your relationship with your partner is likely to grow stronger.
You're more likely to succeed with breastfeeding your newborn.
You're more likely to be confident in your mothering skills.
You're more likely to view the birth experience in positive terms.
You're more likely to see your body as strong and capable.

I just want to have the most positive birth experience possible and feel this would only enhance this experience. I know i'm only in my second trimester but thy are in high demand and I would have to start looking soon. So back to my question: Have any of you used one? Was it worth the cost?