Is a snob anyone who says go with a certain brand as opposed to another brand? If so, I see a lot of people trying to shy him away from HF and iun support of craftsman. Are they "snobs"? One even suggests not to listen to any recommendations other than craftsman, not directly, but alluding to it. There are a LOT who suggest craftsman is the best. Sounds snobbish.
Anyways, to answer the OPs question, there is a test done for this:
http://garagejournal.com/forum/showthread.php?t=73245
While I do not see a HF socket in there, the basic test gives you an idea on how to conduct your own test.
After attending
Rusted and Broken Fastener University
for many years, I still have not graduated, but have learned a few things from the course. Just because a tool is STARTING to slip does not mean you are doomed. You have other options at that point. Spiral sockets, spline sockets, pound-on sockets, certain types of pliers, etc.
There are things that can be done to prevent it such as heat, penetrating oil, proper alignment of the socket, choosing the correct size in the first place (not always the size prescribed in literature, sometimes fasteners are produced with poor/mixed size)
Some people will tell you heat doesn't help with rounded bolts. It certainly does. Deal with it on a regular basis. Rounded 12pt driveshaft bolts. By heating, locktite and rust bond is broken, making them thread out very easily, at a lower torque threshold than required to slip with some sockets or locking pliers. Often can help prevent the problem in the first place...