So I have a pair of 5 y/o KR2 Cores, the lowest flex (110) of the three models originally introduced (Core/Fusion/Pro) with maybe 180 days on them. My most favorite boots of the last 30 years. This thread got me looking for a pair to squirrel away in the root cellar myself and I came up with a smokin' closeout deal ($219) on a pair of 26.5 Kryzma IDs at Steep and Cheap. Kryzma's 115 flex vs the Core's 110 should be a trivial difference. They arrived today and they are indeed identical to my Cores, except for the translucent shell and one MAJOR difference: The heels and toes ARE NOT replaceable. No online description seems to clue one in to that critical difference. In retrospect, a close look at the pics is telling, because every image I've seen of the men's boots shows the replaceable heels and toes in a contrasting color. I'm not sure yet if this is a deal breaker- I have a new pair of boots for less than the retail cost of the Intuition ID liners alone. And it may be fun to play with the two tongues to vary the flex. I just thought I'd post this factoid as it came as an unpleasant initial surprise.