The picture to the right is a mockup of the Mac OS calculator application, made into a real life calculator with mashable buttons and the typical aluminum style of Apple products.
The creator says that the Apple product would cost more to manufacture than its Windows counterpart because of the aluminum it would need. I'm tempted to reference the "Apple tax" (which I truly believe doesn't exist, so I'll just leave it alone). The Mac OS calculator definitely looks nicer than the Windows version -- which looks more like a toy than a usable product -- but from a design standpoint that shouldn't come as a surprise. In fairness, the Windows calculator is based on the XP version and not the snazzier Windows 7 accessory.