Referring to the thread title, as I often say to my kids, dont say no till you have tried it.
Having tried it, I am impressed with the richness of Qt, its availabilty on multiple platforms, and accessability to learners via PyQt to gurus who want to go all MVC stylee.
documentation is excellent, lots of examples and Maemo integration is excellent, and very good tool support with the likes of qt designer and eric for python and qt creator for Cpp.