Once, I tried to write a GUI program in pure win32, that would have a custom window shape like demoscene intros/warez cracktros.
Once.
Once.
I also felt it was unreasonably hard in MFC/Visual C++ to just have a button in a different colour. The RAD system was so barebones compared to what I was used to previously with Visual Basic, and the people in Delphi could make vibrant, colourful GUIs which were a pain in the butt to do in C++.
I will always remember Delphi as the cool RAD system that could create beautiful GUIs but the language is a bit ass, so I never took the time to learn it. (I have never liked the feel of Pascal for some reason)