I believe VG was referencing the fluctuations in estimated ppd as generated by v7 in some instances. While still a little buggy (it's still officially beta) I think most new and indeed many established folders as well would prefer v7 to anything preceding it, especially from an installation standpoint when cpu's and gpu's are mixed. Multiple gpu's in the past were a joyous nightmare, the joy solely derived from the accomplishment of finally beating the thing
Anyway, it was the larger ppd flucuations that sent him back seeking the known stability of FahSpy, a third-party monitoring tool.