I don’t recommend that average iPad Air owners upgrade to the Air 2. But what about the vast majority of iPad owners who own older models? That’s a different story. If you have an iPad 2, 3 or 4, the new Air 2 will make a big difference. Its thinness and lightness will be a dramatic change, and it will be faster and more fluid. However, here’s the catch: Upgrading to last year’s iPad Air would have pretty much the same effect, and that model is now, suddenly, $100 cheaper, starting at $399.