While I think this makes sense, I've often had the feeling that there's a keeping-up-with-the-Jones' aspect to having an iPhone, driving people to get the new models based on comparison -- "Which iPhone do you have? 3G? Oh, mine is 3GS." How would this play out without labels? "Oh, you have a new iPad? Mine is new, I bought it 6 months ago. Oh, is yours a new new iPad?"