Not good quality, but excellent value for light use.
The least expensive set like this you can find: you get what you pay for.
For this style set of 32 long security bits in 1/4 hex, this was the absolute lowest price I could find them for (about $16 after tax).
They are... not the best quality. I needed the T10 security torx for Milwaukee battery disassembly and when I inspected it the center hole (that the security pin slots into to allow the bit to fit into the screw) was off-center. Fortunately, it was not *too* off center and the bit still did what I needed, with a bit of wiggling to fit it into the screw head. T8 was off a bit as well, though to a lesser degree. All the other bits seemed visually normal but I haven't tested their fitment into the appropriate sizes of torx and hex screw heads.
The machining tolerances on the actual torx bitting for the T10 was off as well and wasn't a snug fit compared to using one of my Klein bits.
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All these cons aside, *it did still work* and was half the price of the first set I saw on Amazon. Given this, I have to say for minor/occasional use it is excellent value for the money. This assessment is made if you are seeing this at $16 after tax.
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If you need to use these all the time every day, definitely go with something more expensive.
Also keep in mind there seem to be lots of clones of this set from various sellers/brands. Who knows if they are all from the same manufacturing source or different ones, or maybe if the cheapest ones are just the quality rejects being sold unbranded or differently branded.
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