I'd be interested in experience, tips and comparisons, too!
Especially how GWT compares to extJS and jQuery in terms of performance, ease of use, customization (complex ui design and implementation), maintainability, tools, benefits overall.. was wondering for some time now but didn't get around to use GWT for some project, yet :(
Why not? If they paying you to train in it, there is nothing wrong with GWT. It might not be the best framework to do things in, or it might be, but the learning experience alone might be worth it. You can easily transfer those skills to Java Swing development and Adobe Flex.<p>So doet!