Interesting. We used to use GWT for several projects, but ditched for new ones to simple Java backend and AngularJS.
Now when I had to fix some bugs, etc it feels so unpleasant to work and kinda slow (for dev). Project still uses old GWT 2.5 since transition to new version & 3th party component replacement would cost too much.
Do you use modern super dev mode and latest GWT version? How this turned out? Are there 3th party plugins repository?