What open source toolkit does fatwire compare to and are there some particular advantages to fatwire?
How hard is fatwire to export out of and move to a free alternative?
How stable is it as a platform to write java extensions on?
From a development persepective, FatWire can be unfriendly. Having worked on a number of sites using this application it can easy bloat, and become difficult to maintain.
From a user perspective there has been alot of effort in the UI and this has led to a highly functional tool.
From a client perspective all clients bar 1 (a large news agency) were happy with the end result. FatWire can slow when using complex logic to generate menus or breadcumbs for example or when you have a large amount of content. This is the main reason the one client was unhappy. The FatWire site regularily struggled under the load. It sometimes seen as a solution to all web needs.
As such FatWire succeeds in serving Static Content & Semi Dynamic content, but can flounder when forced to do fully dynamic sites (from my experience).