Advice on getting info/ reviews on adoption agencies

My wife and I live in California and are at the beginning of our adoption journey. We have gathered a list of agencies recommended to us by friends and friends of friends who have used them successfully. We are now trying to find more information on these providers... not a simple task.We would love any advice on resources to get more info on these agencies.We would also love to hear any personal stories via PM on positive and negative (and anything in between) on these agencies.The agencies are:* Adoption Alliance, San Antonio, Texas* Independent Adoption Center, Concord, CA* Adoption Connection, San Francisco, CA* Alliance for Children, Needham, MAThanks in advance for any help or guidance!CB