QOpenGLVertexArrayObject::Binder... Why no more binders?
I found that "QOpenGLVertexArrayObject::Binder":http://doc-snapshot.qt-project.org/qt5-stable/qtgui/qopenglvertexarrayobject-binder.html class is pretty useful to make your code neat and consistent. It also aids you so you don't have to release the VAO manually.
Why aren't binder classes for the buffers, FBO's and shaders? At the moment I've crafted my own ones.