I was looking through the release notes, etc and can't find what the main difference is between the 5.x and 6.x releases is.
Other then that 6.x is compatible with 3.3 and 4.0, and 5.x is compatible with 3.1, 3.2, and 3.3, is there anything else besides new features in 6.x for 4.0 use? 5.x releases are bug fixes mainly.
So for CM 3.3 users, is there any advantage using 6.x over 5.x?