I used to rate Kellogg's Breakfast as 8.5 up to 9 max depending on when it was picked. The first fruits are slightly less flavorful than the later maturing. KBX by comparison makes slighly larger fruit with high production, a bit more flavor zing, and they don't get crud (crud is a physiological condition caused by low temps, indoor lights, and poor soil nutrients). I rate KBX as 9.25 to a max of 9.5 for the perfectly ripe fruit.
Just as a heads up, I sent about 7000 KBX seed to Sandhill Preservation today. It won't be in the catalog, but if you order it, Glenn will have the seed.
http://www.sandhillpreservation.com/
DarJones