Thanks everyone, Merry Xmas!!!
In regards to the warranty and replacement via CC, etc, there really aren't any options. I did buy them with my VISA, but they were purchased from eBay, and when I said 3-days old, that meant my third day with them. I didn't realize this thread would get into this detail about warranty, etc. These were purchased as year old demo skis with a full tune/repair. Upon receipt, top sheets and bases were in near-perfect condition. I bought them in late Summer as 2013/2014 demo skis that were fully tuned with perfect bases and near-perfect top-sheets.
That said, I was talking to my friend today, and it does beg the question whether I should just pay full pop for skis at REI going forward. Normally I try to buy brand new skis that are one season old, but I really wanted Kendos after demo'ing 15 different skis over the past two seasons, and I found these. These are the first used skis I've bought, but buying them used had nothing to do with the unfortunate incident with the rock : /
For what it's worth, the only other ski I had particular interest in was the Kastle MX88, but I hadn't been able to find them for demo, and there weren't any examples to buy at reasonable price. Having tested the Kendos twice and really liked them, I struck on this deal as it was a ski I really knew I wanted to replace my aging Nordica Hotrod Jet Fuels. All that said, buying these, there is no recourse via credit card, return, sympathy, etc. I can live with that considering the reasonable deal I got and the condition they were in upon receipt
I've hit many rocks and had to have base repairs done, but I caught this rock on a hard turn on a very steep run right under the boot. Initially when I heard the rock hit I didn't think any different of it except maybe I'd have some minimal base damage, but later on that run when I couldn't hold a fast long-arc right-hand carve at high speed (~50mph), I knew something wasn't right. The damaged left ski was wobbling and unstable, it was all over the place; I had to rely on the inner right ski to get me through the turn, after which I noticed the inside of the ski was coming apart. I'm actually fortunate, I really could've wiped out hard as that left ski was all over the place. The repair guy said, all it takes is getting the rock to hit underfoot at the right angle and it's all she wrote...
Live and learn, I'll consider full price REI next time though as I've had good experiences replacing things for random things (broken expedition tent due to high winds, etc.).