FLEX & MXML The next logical step for XHTML coders?

I’ll be perfectly honest.. I didn’t know much about Adobe Flex. I knew that it was more or less an all coding method for Flash developers and the early adopters using js/ajax really enjoyed working with it. Flex based sites had always impressed me but the idea on how to make them seemed to complex. Since Flash MX had been released I had little experiance writing any sort of AS other then animating banners or updating AS for all ready running sites.