Red Hat Advanced Server questions

Had a couple of questions come up about Red Hat Advanced Server, comparing to "regular" Red Hat Linux and other issues. I figure this is the place to ask. Maybe some of you have used it already.

1. It's Linux based so most of it should be Free or Open licensed. But, is it copyable? If I want to kick the tires before I buy, can I get a copy from someone or download it from somewhere?

2. Knowing the power of Linux, I know that standard Red Hat or another distro can do any server operation that I want. So, what value does Red Hat Advanced Server bring to make me want it over a "regular" distro? (I have read the marketing speak at the Red Hat site. I am looking for real world reasons here.)

Alan