Visual WebGUI

I'm doing some consulting as a company who are trying to speed up delivery of CRUD web forms and are looking at a product called Visual WebGUI.

http://www.visualwebgui.com/

Looks pretty interesting. At design time you seem to be working with WinForms forms and controls and then at runtime it translates this into HTML. 

At runtime it generates the equivalent HTML and does a lot of stuff client side. I had a button and a textbox on my form. On click of the button I set the text of the textbox to "Clicked!" and there was no postback. 

Anyone with experience with Visual WebGUI, I'd love to hear what you liked and what you didn't. If you had the time over would you still have used it?