Re:
Yes the Wera stuff is very nicely made. The hex keys I have, have a slight concave in each face, they call it "Hex Plus", which is supposed to allow more torque without rounding out the socket on hex bolts.
I haven't really tested it, but I have had hex bolts "round out" in the past, especially with the smaller sized bolts where they have corroded and perhaps seized a bit, or perhaps where the bolts are poor quality. It will be interesting to see if they are less prone to that.