My sister used Ellie, Heather and Jenny for her son's birth last April (and I got to be there--happy dance!). They were wonderful and they were really flexible (took her very late in her pregnancy, worked with her on payment, etc.). It was clear they really care about what they do.
I just want to point out that Ellie and Heather no longer practice together. They are both wonderful, but now you have to choose!