@burcidi-- I've heard about that case, but what Apple did with that product advertisement wasn't puffery, it was product representation (or misrepresentation).
We learned about these concepts in my business course last week. My instructor defined puffery as wildly exaggerated, superlative, vague opinions (hyperbole). Saying that a product has WiFi is not puffery, it's a claim, a representation of the product. Puffery is not explicit, it's subjective and it doesn't have factual claims.
A good example of puffery is the advertising propaganda that one dog food brand uses. They say that this dog food is "the choice of the champions." This is puffery, there is no fact there. It's not even something that could be proven. It's vague and exaggerated. Another example is when restaurants advertise that they use the "freshest ingredients" to make their food. Freshest according to whom, in comparison to what, they don't say. It's vague and again exaggerated.