The sales growth doesn't surprise me. A year ago the only grocer near me who stocked it was Whole Foods and they were frequently out of stock. Now, almost everybody has it.
I can endorse the lemon, vanilla, and most especially, the sea salt caramel flavors as excellent. I also like the Enlightened "Hot Cocoa" flavor.
UPDATE: Long-time reader of this blog, Michael Greenspan, sends this "Breyers' Gets In On The Low-Calorie Ice Cream Trend" with the comment, "Competition is good."