1. It's a lot easier for me than Tiles when I want multi-part window layouts.
2. When an exception is thrown inside the backing bean, I get a much more usable error page than I do from straight JSF.
One of the most odious afflictions that Business has inflicted on the modern English language is "pro-active". Most of the time it's simply redundantly used in place of the simple old word "active". And a good deal of the rest of the time it means "You're not overworked enough yet, so go out and find more!"