I used this feature in Websphere Studio Application Developer (WSAD) for a year until I decided that I prefered to just work with straight HTML and tags. Why? Well, at least WSAD’s visual editor was VERY slow, and its code formatting and placement was never the way I wanted it, especially when working with tags dependant on data returned from the DAO layer. Made it really hard to componentize later. Speaking of, since we broke our pages down into small, granular components, they’re a lot easier to manage, leaving us with little need to see it visually at design time.