"Okay, then say someone came along and offered you a pair of shades. And maybe they're a different brand, and you've never tried them before. They could be sort of uncomfortable, you don't know. And they're not even new. They've got a few cracks, too, but in different places, and the person says 'try my shades! They're just as good as the ones you have'. Would you get rid of your old shades and take the new ones?"