NWVault's NWN2 Review series continues today with Adam Miller's toolset review. It's fairly concise and generally quite positive, though certainly indicates that there's a lot of room for improvement. One of the major problems he cites is toolset crashing and, much worse, module corruption. That's a major problem that needs to be addressed.
Nevertheless, he reports that "the NWN2 toolset is a nice compromise between power and ease of use, not perfect, but better than any other toolset I've worked with." That's very good news, coming from one of the most prolific module creators for NWN1.