It's an S30V leek with black g10 scales and stainless liners. I bought it over a year ago because I specifically needed a small, one hand-opening pocketknife at work (usually when I'm hanging off a ladder) and I just hate those stupid exacto/razor blade knives (the blades always seem to head straight for my head when they break). The knife is used every day and I've only ever had to sharpen it once (best production blade I've ever owned, but of course I have a price limit). As for the cement bags, you don't cut into the product inside, just the fold on the top of the bag (open it up like a zipper - edge up). I bought it as a user, and I use it. If the blade ever gets trashed, I'll make a new one.
irwin does make some "unbreakable" bi-metal blades and there is a spring assisted opening razor knife. just as a suggestion, obvisouly you bought a leek to use it but if you ever do get to a point when it gets impraticle to keep sharping it or what ever you have some good options.
then again making a new blade is a good option too (didnt notice that part of your post at first)
-matt