For $30, I learn the basics of the rules quickly, and learn if my groups gaming style works with 4E. If it does, then I will continue to buy the core books. If it does not, then I do not have to spend the money to buy the core books, or spend the time to learn the rules in-depth.

That being said, Its not all that much of a price. I just view it as spending the 2.5 hours I worked to get the money for it, to get the chance to make an early decision on whether I'll be buying 4E or not based on the content of their system, not on guesses and half knowledge on the system.

I like 4E, both from the previews and the quick-start rules, and getting the chance to see if its an investment that my group will make is worth it.