I have had Jenny Haskins Quilt Express, EQ6 and the EQ7 upgrade. I LOVE the EQ product. That being said, it depends on how comfortable you are with software, What you want to do with it and what you want to spend.
I started with the Quilt Express - cost me under $30 at the time. It could not do what I wanted. I could not change blocks or create blocks that I wanted. When I looked at the full version, I did not really like it. I bought EQ6 (the DS gave me the EQ7 upgrade for Christmas).
I really like it and am still learning the software. There are also several sites that offer online classes to work through the software.