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Wera makes their hex keys unlike any other I have seen. A traditional hex wrench is just flats. The Hex-Plus profile has concavity to it, so the key carries the load across more of the screw instead of digging into the corners. The result is a grip so secure it is nearly impossible to strip out a hex screw, short of one that was cheaply made to begin with. I could not put my finger on exactly what they were doing differently the first time I used them. The contact area is the answer, and you feel it the moment a fastener that should have rounded off instead just backs out.
The ball ends are the same story. I cannot tell you precisely what Wera does differently here either, but they work better than any other ball-end L-wrench design I have used. They hold their angle and bite when you are coming at a screw crooked in a tight spot.
The material and craftsmanship are exactly what I expect at this price and from Wera. Even the tool holder is extremely well made, and I have yet to have a key wear out or break. This was the first set of L-wrenches I ever bought with color-coded sleeves, and now I can never go back. Without the color coding it is usually the third wrench you pick up that turns out to be the right size when you have them spread across the bench mid-job. The color sorts that out instantly. The holder also has a magnetizer built into it, which is a nice touch for hanging onto a fastener.
A couple of downsides, and neither is a deal breaker. The keys can get hard to pull out of the holder after a good amount of use, once the sleeves start to flare a little at the business end. And the sleeve material itself is sturdy and holds up great, but the printed size markings do wear off over time. The color stays; the numbers fade.
One buying note. Wera sells this same set in two imperial versions. Get the one in the standard clip holder, which is what the links here point to. There is another imperial version that ships in a bulky case instead of the normal Wera holder, and I do not like it nearly as much. These fall firmly in the buy-once category. They cost what they cost, and they will outlast almost anything else in the drawer.
Metric set Imperial set Amazon