One complaint was that once the project started growing past a certain size, the compile times (into javascript) took significantly longer.
The rapid development cycle that we had in the beginning of the project seemed to disappear. Occasionally some strange GWT bugs started popping up, but figuring out what was wrong was very difficult GWT is by nature Java compiled into JavaScript, and tools like Firebug would give a non descript JS error message. This was several years ago though, around GWT 1.5 or so.
I don't have any GWT 2 experience and I should have emphasized this, however I witnessed another project (a year ago) based around GWT 2 and although with capable programmers, they found GWT to be a burden rather than a benefit, and frankly the result looked horrible.
The rapid development cycle that we had in the beginning of the project seemed to disappear. Occasionally some strange GWT bugs started popping up, but figuring out what was wrong was very difficult GWT is by nature Java compiled into JavaScript, and tools like Firebug would give a non descript JS error message. This was several years ago though, around GWT 1.5 or so.
I don't have any GWT 2 experience and I should have emphasized this, however I witnessed another project (a year ago) based around GWT 2 and although with capable programmers, they found GWT to be a burden rather than a benefit, and frankly the result looked horrible.