I have these style wrenches - they're the same ones that are included with the 80966 mechanics tool set (but smaller range) and not sure I'd recommend them.. Not that they're "bad" but I actually found the 6-point ends to be annoying to use, and almost always reach for my 12-points first.
For fasteners that were in bad shape, am usually able to get an extractor socket on them so haven't come across many situations where they were really needed.
The open ends also feel a little sloppier to me than my "normal" (12-point) long pattern gearwrench set.
If I was going to buy a new set of wrenches today for anti-slip purposes I'd look at something else that had "RBRT" or similar in another brand. Anyone here use these or anti-slip wrenches professionally? Would be interesting to hear experiences.