When you show someone Apple’s new 13-in MacBook Pro — the one with the virtual Touch Bar — the first thing they’ll want to do is play with the darn thing. They’ll adjust the screen brightness or turn up the volume. Launch some apps to see the virtual buttons change. And slide their fingers along it to see how it feels.

And they’ll probably agree that, as innovations go, this is one cool update to a laptop line that was long overdue for an upgrade.

But that’s not the only big change to the 13-in. model that I’ve just unboxed — or the larger 15-in. models due to arrive later this week. Here’s what would-be buyers eyeing the new MacBook Pro are most likely to notice.

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