Generally they are regarded as being very BAD to publish with. They do not support their authors, and on a work like a children's book, you could stand to make a lot of money with a traditional publisher. With Publish America, I believe, you will not. They take the rights to the book for 7 years, and that tends to be a big no no. From what I understand they are a print on demand company. You will not get your books in book stores, you will have to all the promoting, and a bunch of other problems I will not get into. However, I think you should do all the research you can. Don't take my word for it, go out and get other people to tell you what they think. Also, look at as many boards and authors as you can. Good luck.