I’ve been working with wx for a quite long time. Two years ago I was looking for good portable GUI library for C++. I tried many of them but I must say - it was a hard decision to make. I chose wxWidgets and let me show you an opinion.

Pros:

• good documentation
• wide community
• high portability (and what’s important - it’s native)
• free license
• many components contributed by users
• support for image, network and files management
• it’s very mature

Cons:

• architecture similar to MFC
• omnipresent C macros :/
• no STL
• lack of modern C++ features
• There is no stable and free GUI editor (Commercial ones are really good but expensive, free ones are useless)