Benefits of a Doula
A current review of 21 studies confirmed that mothers who have continuous trained labor support: 
Hodnett ED, Gates S, Hofmeyr GJ, Sakala C, Weston J, Continuous support for women during childbirth (Review), The Cochrane Library 2011, Issue 2
Research also shows parents who receive support can:
Feel more secure and cared for
Are more successful in adapting to new family dynamics
Have greater success with breastfeeding
Have greater self-confidence
Have less postpartum depression
Have lower incidence of abuse
From DONA International
The benefits of a doula are many, and on top of those listed above, it can also save people, hospitals, and insurance companies money!