You might try shaving one leg and using Nair on another. You'll find that the stubble on the shaved leg will feel a bit more bristly because it's cut with such a straight top to it. Depilatories can leave the end feeling a little less sharp.
That's the basis for claims that depilatories last a little longer. They might get a little further below the skin's surface, but I believe the real benefit it the blunt tip of the hair.
[ July 13, 2002, 07:30 PM: Message edited by: Andrea ]