I've bought several Case knives over the last few months.
I bought my first Case was a few months ago. I was in line at a hardware store and saw it across the room....amber bone mini trapper, I asked to see it and it was perfect so I bought it.
Based on this mini trapper I thought Case's products were pretty good but I was wrong.
I ordered my other Case knives over the internet and regret it. Their quality is so "hit or mis", unless you can personally examine the knife it will most likely be a "mis".
As far as the stainless vs carbon, my mini trapper is stainless, it was OK sharpness when I bought it but it sharpened easliy and edge holding is acceptable to me. I use it for every day stuff like opening mail/packages, cutting fruits for lunch, and other light stuff.
I don't think their products are tough enough for heavier uses. My Copperlock is just wimpy compared to my Buck 112 but costs twice as much.
My overall opinion of Case, is their quality is poor compared to other slipjoint manufacturers. If there is a particular model you like, I recommend hand picking it from a local store and do not buy over the internet!
There was a good write up on how to pick a slipjoint posted about 2 months ago on this forum. I recommend reading it before you buy any slipjoint, except those by Victorinox or Wenger.
Good luck,
Collecter