Is 2.7 a development release or a stable release?

Are the 2.7x releases stable releases or development releases? I ask because I remember that 2.5x was a development release series and 2.6x was the stable release series, so I wasn’t sure if the same thing was going to happen with 2.7x and 2.8x. The infobox on the Wikipedia article on Blender says it is a stable release. I’m not sure if I should upgrade or not. I had problems with the 2.5x series (though I’m not sure I remember what they were) and I had to use 2.49b for a while before 2.6x was released.

The releases are ‘stable’ versions.