I've been through the class three times at their original flood house in Burlington, WA
The first time I took it was before ASD was even a
IICRC approved course. Loved the class!
The last time I took it was a about four years ago. Wasn't as impressed. The info was good, but the fit and finish of the class was lacking.
Being that your newer to water restoration you will get your monies worth no matter what advanced course you go to.
Personally I would go here.
http://www.aspire-centre.com/
Barry has an awesome course and you will learn, hands down, more here than in @ Dri-Eaz's course.
I say this after going through D.E course three times and having taken Barry's classes the same number of times.
After you have the ASD under your belt then I would travel to the Reets Academy in Georgia and learn how heat drying can help your business.