I have two sets of those Duro/Indestro short double box wrenches that go from 6mm-20mm. I bought them in a closeout place around 20 years ago. I also picked up a set of double open end wrenches that went up to 32mm that day.
The short box wrenches are well made but walls of the box ends are noticeably thicker than my SK set. Good wrenches though, and short metric offset box wrenches are not that common to find cheap.
I like using this style wrench. There are times when the offset and length make these just the right tool. If I remember to throw the common sizes for the car I am working on in the cart, I almost always end up grabbing one for at least one bolt rather than just using a combination wrench.