I only want Diablo MidPlus grommets because they fit my favored stick now, the POG Longbody.
I never demo-ed any Diablo, mostly because they have those Triple Threat elements in there (Titanium, Tungsten and Carbon) along with the Graphite. That was the makeup of the Prince NXG lineup, which was real disappointing.
If you want a Prince mid racquet, there is no substitute---it's the POG Mid. Period.
Just demo the POG and the Diablo from TW, and decide from there.