For me it's worth it. Although my Decorated Small Sebenza was my first CR knife, my Umfaan is my EDC because it's convenient, non-threatening, and handles most of my knife needs.
My first Umfaan was stolen, and I swore I wouldn't spend another $300 for a tiny knife. But I missed it dearly, every day, even though I still had my Sebenza, and I bought a replacement without regret.
I "lost" my second Umfaan twice: once jammed between my car seats for a month, and then dropped at my friend's house beside a couch. When I "lost" my Umfaan in my car seats: I swore again I wouldn't spend ANOTHER $300 (for a total of $900!) for a tiny knife, but I missed it so much I almost bought a Decorated Umfaan (at $450 for a total investment of $1050!!!) before I found my lost Umfaan.
The slip case is worthless for pocket carry. Eventually it loosens up to allow the Umfaan to slip out and bang against keys and coins. Also, the small size means you WILL lose it if pocket carried.
My solution was to install a longer lanyard of sufficient length to loop around the my belt, and hang my Umfaan inside my pocket without touching the keys and coins at the bottom. This prevents loss and damage.