It has been quite a while that I have been using Flex for Developing projects. I found Flex has been quite interesting and with new versions of Flex SDKs, its started getting rich. New components, skinning techniques and improvements in IDE has been key factor in growth of Flex popularity. Though I would like to admit that we faced many ups and downs while using Flex (well there are still some) but overall experience with Flex was quite good. Delivering web applications using Flex definitely adds value to the product in terms of look and feel & also due to its feature rich components.