I'm not familiar with Karon's course per se, but I have worked with her on a professional level and would highly recommend any of her products. She's fantastic and extremely knowledgeable when it comes to writing for the web.

I've only heard some of her webinars, seemed like good stuff. If you're on the fence, try signing up for some of those. She'll often offer a deal at the end of the webinar, too. Could save you some money.