So far, so good. It's very different from your typical template-driven approach. We have a decent amount of Swing experience, and developing with Vaadin feels similar (but much easier) than Swing.
If you are developing business-facing applications and not just consumer web sites, as we are, I think Vaadin makes a lot of sense. It might even make sense for consumer sites, but that's not our current target.
I should also say: putting together a new screen (form or otherwise) in Vaadin is extremely fast. It's the fastest I've ever been able to develop web-based UIs, simply because all I'm forced to think about is Java.
I see. I found it to be a little difficult in terms of dealing with data, especially messing around with the Table object. Best of luck to your project.
