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Bottom line: Yes, you should upgrade to iOS 9

Bottom line: Yes, you should upgrade to iOS 9

It's faster and more secure, it'll use less power, and it doesn't need as much space as iOS 8 did. Just get it!

“Should I upgrade to iOS 9?” is the question I hear the most around launches like this, even more than, “Should I buy a new iPhone?” People generally know if they want the new hardware, but whether or not to put a new OS on a device they already own seems like more of a gamble.

I’m here to tell you: iOS 9 is a pretty safe bet.

First of all, it runs on every device iOS 8 runs on, going all the way back to the iPhone 4s. (And when I find the iPhone 4s I bought back in 2011, and was in service as my husband’s phone from 2012 through 2014, I’ll thoroughly test it and let you know if iOS 9 is usable on the thing.) Since iOS 9 has been in beta, we’ve tested it on a few devices, including iPhone 5s, iPhone 6, the third-gen iPad, an iPad Air, and an iPad Air 2. The beta versions have been extremely stable, and none of the hardware we’ve used it on became sluggish or felt hampered by the new OS.

Less space required

Last year, the upgrade to iOS 8 soured some iPhone users, who wanted to update over-the-air but didn’t have enough free space. Well, that problem has been remedied—iOS 9 only needs 1.3GB of free space to install, compared to the whopping 4.58GB iOS 8 needed during an over-the-air installation. In fact, Apple even has a workaround called “automatic app deletions” that can temporarily trash your largest apps while keeping your user data intact, so when the update is done, the deleted apps will be automatically restored, with the correct data, just like you’d left it.

ios9 compatibiltiy chart Apple

Got one of these? You could run iOS 9.

Plus, there was a snafu with a bad 8.0.1 update that was immediately rolled back to 8.0 and quickly replaced with 8.0.2. At the end of the day, the 8.0.1 update problem didn’t affect that many users since Apple pulled it so fast. But if you’re nervous, that’s understandable, and the solution is simple: just wait a couple of days to see how it shakes out.

New Metal and more power

What if you aren’t interested in the new features like the revamped Spotlight screen, or the brand-new News app? What if you think the all the handy little changes in iOS 9 aren’t enough to get excited about? Or your iPad is too old to use the new multitasking tricks? Apple made lots of improvements under the hood that should improve your experience even if you don’t touch the new stuff.

All of Apple’s own apps were rewritten with its Metal API, which takes better advantage of your iPhone’s GPU for graphics and data processing. This should make your iPhone feel more responsive when performing the same old tasks.

Apple also made tweaks to affect battery life. Low Power Mode offers to kick in at 20 percent and again at 10 percent, and when you enable it, it can prolong your remaining battery life up to three hours. But you still get to use Wi-Fi, Bluetooth, location services, and all the other bells and whistles in iOS. Instead, iOS intelligently quits background processes like email fetch, dims the screen slightly and sets it to sleep much quicker, and reduces visual effects like parallax and app-opening animations.

ios9 slideshow low power mode Apple

During the beta period, Low Power mode saved my bacon (and my ability to listen to music on the long commute home) so many times.

I use Low Power Mode almost every day, and while the quick-sleeping screen can get kind of annoying, the benefit of having a functional iPhone is far worth that tradeoff. It does slow down the processing speed, which can be noticeable depending on what you’re doing, but it hasn’t bothered me (although to be fair I’ve been using it on an iPhone 6.) If you used to worry that upgrading your iOS would lead to worse battery life, iOS 9 should make that better too.

Bottom line

I still haven’t mentioned security factors, like a longer default passcode (now six digits over four), streamlined two-factor authentication process, and the ability to block content in Safari will the help of third-party extensions. Apple puts a lot of emphasis on security, in part to differentiate itself from Google’s MO of amassing tons of data on you for more targeted advertising. But the upshot is a safer phone, and Apple’s ability to roll out security updates directly to the entire iOS 9 user base at once is another plus.

So the bottom line is, you should update to iOS 9. It doesn’t have to be today, and it doesn’t have to be tomorrow. (If you have concerns about a specific device, or the compatibility of a specific app you depend on, let us know in the comments and we’ll do our best to address it.) But iOS 9 is a speedy, stable release with a lot of handy new additions, and we at Macworld think it’s a worthy upgrade.

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