The timing of the iPad's launch was also fortuitous. As Apple has learned, iPads have a significantly longer upgrade cycle than phones, which helps explain the recent sales decline. Plenty of iPad owners have gotten three or four useful years out of an iPad, if not more. But as those pre-2014 iPads are starting to get long in the tooth, Apple has released this new model that essentially took the Air's body and put in far more powerful guts. And to spur upgrades, Apple made it significantly cheaper than the usual $500 entry price for new iPads.

While the new iPad's low price was likely the biggest driver in this quarter's sales bump, it's also worth pointing out how the new iPad Pro models help make the entire lineup a lot more logical. Back when the 9.7-inch iPad Pro was released, it was hard to say whether buyers should spend $600 for that device or $500 for the iPad Air 2 that had double the storage space.

But now Apple has differentiated the two iPad lines in both price and features, and that makes the choice of which to buy much easier. If you want the basic iPad experience, the new iPad is the one to buy. And the recent improvements to the iPad Pro lineup make it a lot easier to see what you're getting for the extra cash. Most important is the display: It's laminated to the glass, has antireflective coating and features both the TrueTone color adjustment technology as well as the wonderful 120Hz refresh rate. That's to say nothing of the better speakers, more powerful chipset and Smart Keyboard and Apple Pencil support. Add that all up and the case for the iPad Pro is clear, even if most people will still opt for the more inexpensive model.

Just because Apple cleaned up its iPad lineup and increased sales for the first time in years doesn't mean sales will continue to grow. While the 11.5 million iPads the company sold in its fiscal Q3 is impressive, it's far less than it sold in the same quarters back in 2014 and earlier. We'll have to wait three more months to see if the new iPad Pro models that came out at the tail end of the quarter will drive sales like the cheaper iPad did. It'll certainly take more than one good quarter to say whether the iPad has regained its momentum. And while Apple sold more iPads than it did a year ago, revenue for the product category only grew 2 percent -- that's what happens when you tempt people with a significant price cut.

If you look at the iPad's sales trend over the years, it seems more that the market is stabilizing; it's unlikely that sales will return to 2013 levels, at least not in the immediate future. But all of Tim Cook's comments on the iPad through its downturn made it clear that the company is in it for the long haul with its tablets and won't let a few years of slumping sales deter the company from that vision.

It's also a product mostly without peers: After all, most companies have given up trying to compete with the iPad. That's partially because the tablet market appears smaller than it first seemed, but it's also a testament to the quality of Apple's experience. Making the entry-level iPad so cheap is almost unfair to the competition; Samsung may make premium tablets, but the dearth of tablet apps has always limited Android slates. Now that the iPad is more affordable than ever, there are few reasons to look at other tablets. It may not be a company-defining product like the iPhone, which accounted for 55 percent of Apple's revenue last quarter. But the combination of a balanced product lineup and a tempting starting price means that the iPad will likely continue to define the category for the foreseeable future.