zvh is fraught with its quirks, but not everyone has these issues. For me when I tried it, I rolled back to zvd, as I missed the custimization of cm7. But on the other side, I have been reading very good things about the new community project YourMomRom.
And dont forget that is very simple to roll back if you dont like it.
But in all seriousness some people have had some issues with the ZVH update, but others have not. Honestly I say go for it. If you are one of the people that have issues, reverting back to ZVD is pretty simple.
the double tap killed zvh for me. Also I could never get the camera to work right using zvh while overclocking -- always produced haze and lines. I could back down to 600mhz and the problems would go away, but then no overclocking...
I loved the text selection features of GB, but ultimately went back to zvd.