I have owned both the MDP and Tanto versions of the Stiff KISS and love them both. As was mentioned above, one of the best aspects is that they're so inexpensive, using or losing one isn't that big of an issue.
I used to wear the tanto around my neck every day as a "back-up" of sorts to my beloved CRKT KFF in my pocket. My thought at the time was that, around the neck it would be accessible with either hand if for some reason I couldn't reach the KFF (e.g., a groundfighting situation), although the draw was a little slow. I never had a problem with it printing, especially when I wore it under a shirt with a tie (which is the std. apparel in my office).
I bought the MDP with the thought that it would be my primary line-cutting knife when surf-fishing in waist deep water, as I was concerned about salt water corrosion and figured that you can't find an easier blade to keep clean. But alas, my sister started working in a rougher area of town and was very concerned about aggressive panhandlers so I gave it to her.
(Good story, though: her fears were somewhat justified. She was later harassed by a panhandler who grabbed her as she walked past. Instead of pulling the blade, she grabbed the back of one of his hands and laid a Nikkyo/center wrist lock on his wrist, twisted it as hard as she could, and threw him face-first into the sidewalk.)
Anyway, although I no longer wear one every day, I'd still recommend either the tanto or MDP. For $20 - $25, you can't go wrong with it, and it sure beats being empty-handed. They're also dern handy to have around your neck when surf-fishing.
