I find QT Creator underwhelming, especially compared to intellij. You have to stick to a single window, the interface to gdb causes me to pull my hair out most of the time under OSX, the refactoring support is almost absent, the keyboard shortcuts are a pain to manage (to make it emacsy, at least a bit).

I currently use eclipse for my embedded C++ project, and QT creator for QT apps (QT is wonderful!), but intellij for pretty much everything else. Looking forward to this.