I couldn't find a thread on this already, but I'm sure the issue must have come up for others.
On my 111mm SAKs (or at least my DAK & OHT, as I rarely carry my Helmsman, and use it with kid leather gloves), the liners on the contoured ends, where there is no tools to support them(holding the knife in your right hand as if you intend to use the main blade, look at the top right and bottom left), tend to bend in. Mine have not bent far enough to affect any usage, but it's still slightly weird and a bit of a shame.
I also find gunk gathers in that area around the main blade hinge more than small SAKs, but that might be due to the DAKs square rather than curved tang.