I'm familiar with them. I've gotten 2 books published through them. If you read all the information on there web site you'll get an idea what they are about.
It is my understanding that Publish America is a print-on-demand operation. When I published the last book in my series with a POD press (not PA), I had three goals that had to be met:
1. I had to have format options and set the release date
2. I had to be able to get reviews
3. I had to be confident that I would break even at very least.
Before you work with any sort of non-traditional press you should have a thorough understanding of how they operate and a clear idea of your goals.