I don't have the kristin, but do have several other bags with the pre-treated leathers from the coach list (hamptons, alexandra.) No Appleguard, didn't like the pre-test results.
My kids have spilled orange juice on two of my brand new bags: one an alexandra convertible (this past year), and the other a hamptons tote in the classic glove-tanned leather (in 2001.) No sign of the spill on the Alexandra

, but you can still see the spot on the glove-tanned Hamptons. I still love the older Coach leather because it looks fab even after 10 years of daily abuse, but I am VERY impressed with the durability of the new pre-treated leathers after the latest spill. Still an issue with scratches, but great on spills...