That’s why I still work with Cubase 6.5 and Nuendo 5.5 in my commercial studio with clients. That’s why I have set up three test systems with Cubase 7.5 and Nuendo 6, both on Windows 7 and Windows 8.
I do this because I am a genuine professional 
Shall we move on? Shall we?
I have tested this major cycle, C7/7.5 and N6 since their release, so I’m not exactly unfamiliar with them.
I also use PT and Studio One, but that’s for another forum.
PS. Read my signature for an answer to what DAW a genuine professional uses, and what he has for testing.