Cubase 7.5.1 works really good for me, no apparent show-stoppers. Actually it works better for me than anyone of the big ones out there(Logic, PT11 are the ones i have extensive experience on with a bias in my knowledge towards Logic).
What I mean is that it doesn´t feel beta. If you want beta, try LPX and come back here after trying to produce a full modern production, and tell us all about it.