IMHO, the Cabernet Extreme are the best Cabernet/Bordeaux glass available. I have compared them to the Reidel Sommolier, widely accepted as the best, and found the extreme do a better job. They are large enough, very well balanced, so they are comfortable to handle, and so a better job of focusing the aromas.
IMHO, the extreme is a refinement of the Sommolier at a vinum price. They are my everday glass.
I break less than one a year, another common complaint about the glass.