This is the third time in five years I used this site and its been a great experience. We've have been fortunate to have only great nannys and found them within a month of posting our ad.
My recommendation to others is to be very clear regarding your priorities, hours, work load etc and you'll find what you need on this site. I also have my nanny interview the new nannys as I'm searching to help me find the best possible nanny for our family,