Cheap bass strings that still sound good.
These strings may very well be the most affordable bass strings that there are, and sure they have their shortcomings: mainly lack of body to the tone (they sound a bit scooped), low durability (compared to my standards and considering my playing technique, that is),
and some kind of rawness to the touch (by that I just mean these are just not silky smooth and soft like some more expensive brands are); but their not that bad either, and especially I like their presence in the higher frequencies.
I consider them to be a very viable option in various situations.
For instance:
These are definitely good for a student, or someone who just play to himself and as such has no need for a particular tone.
These are good for someone who uses a very effected tone, and so is not relying so much on the strings alone.
These are good for someone who plays heavy music, mainly metal, and would go for a scooped sound anyway.
Also could be good for someone who likes to change strings very often to keep the fresh sound and doesn't want to spend a fortune.