Is GTKmm a good library?

[Zerpent]

I have just installed GTKmm to work with Visual C++ 2010, in case I need to make a GUI sometime. From what I understand, there are many libraries that can help you to make a GUI with basic windows and buttons etc. .

But why are there so many to choose from?
What do you think about GTKmm? Is it totally cross platform?
Do many companies that employ C++ programmers use the GTKmm library?

[andywestken]

I think Qt and wxWidgets are better if you're thinking totally cross-platform.

GTK+/GTKmm don't have such a strong reputation when it comes to running on Windows.

Andy

[Zerpent]

I see, I will take a closer look at those too.