CppCMS vs. C++ Server Pages vs. Wt

I know Wt is the most stable of them, but it's a bit uncomfortable to use.
CppCMS sounds good but how stable is it? How secure is it?
I have encountered C++ Server Pages as well but there's nothing about their security in there.
Has anyone had some experience with any of those libraries and can enlight me?

First of all, several differences:

1. Wt is GUI like framework, it is quite far from traditional web development. So, if you want to develop a code as if it was GUI it is for you.
2. CppCMS is traditional MVC framework optimized for performance, it has many features like template engines, forms processing, i18n support, sessions, efficient caching and so on, support of various web server APIs: FastCGI, SCGI and CGI. If you come for Django world, you would find yourself at home.
3. I'm less familiar with the third project, but it feels more like PHP -- you put the C++ code inside templates and has no clear separation of View and Controller.

Stability, I can tell only about CppCMS, it is stable, and there are applications running it 7/24, the authors blog and the Wiki with documentation of CppCMS are written in CppCMS. So, there shouldn't be major critical bugs.

Disclosure: I'm developer of CppCMS.