Apple's new online service, iCloud Photo Library, lets you seamlessly access, manage, edit, and share pictures and video from your iPhone, iPad, and your Mac.

It's free to use — though if you want to store any real amount of data, you're going to have to pony up for a paid iCloud plan. With Photos for OS X on the horizon, I've had a lot of people ask me whether they should turn on iCloud Photo Library: Is it safe? Is it secure? Is the cost of an iCloud plan worth it? After several months of both iOS and Mac beta-testing, here are my thoughts.

What is iCloud Photo Library?

We've got a much more thorough piece on this matter linked below, but essentially: iCloud Photo Library is a separate service you can enable in both Photos for OS X and Photos for iOS that uploads every image you've taken or have stored on your iPhone or Mac's library to iCloud. That includes iPhone or iPad photos and screenshots, along with any imported DSLR or other photos you've added to your Photos library on your Mac.

You don't need to use iCloud Photo Library to use Photos for OS X or iOS, but if you choose not to, you won't get any of its benefits: your images won't sync across devices, you can't optimize storage for your devices to save disk space, and you'll have to manually back up your photos elsewhere.

The pros

After several months with Photos for OS X, iOS, and iCloud Photo Library, I'm pretty familiar with its ups and downs. Thankfully, there are far more ups and downs, at least in my experience.

It just works — really!

Perhaps the biggest bullet point in iCloud Photo Library's "pro" column for me is that, for once, Apple's iCloud team has a rock-solid "it just works" sync product. Even during my early beta-testing days, I had no issues with iCloud losing or dropping images from my library.

I had only one sync error, which came from accidentally turning iCloud off on my MacBook before it had finished syncing up that library; as a result, those half-uploaded photos disappeared from my other devices. But they remained on my MacBook, and repopulated on my iPhone and other Macs as soon as I re-enabled iCloud sync.

You really can access your photos from anywhere — and manage them, too

Previous to iCloud Photo Library, I used Loom and Dropbox's Carousel features to keep master copies of my images. This was great for having access to my full image library, but it was only really accessible while I was online, and there was no real way to organize it beyond pre-built rough date scroll along the side. Deleting images from Dropbox's Carousel was also a royal pain — the app was built more for hiding images then deleting them.

With iCloud Photo Library, my images are accessible everywhere — and when I'm offline, I can still view low-resolution thumbnails of any pictures I haven't downloaded locally to my machine. I can even manage my library while offline: Delete an image while you're away from internet access, or add it to an album, and all of that syncs when you pop back online.

In addition, iCloud Photo Library solves one of my oldest iPhone photo management irritations: I can manage albums on my Mac and have them sync to my iPhone, and vice versa.

Your edits also sync across your devices

Forget having to make multiple copies of your images to edit them: iCloud Photo Library syncs your non-destructive image edits across your devices, meaning that you can start editing an image on your iPhone, finish the touchup on your Mac, or undo it all on your iPad.

All hail optimized storage

iCloud Photo Library's Optimize Storage option automatically and smartly takes a percentage of your device's storage space for high-resolution versions of your photos; any images or video that can't fit in that space are stored as low-resolution thumbnails. This space is variable, too — it doesn't take up every speck of free space you have, instead appropriating a portion of your free space to photo storage, and it adjusts smartly on the fly.

If you need to download an image stored on iCloud, you need merely to tap it; your older downloaded images will be removed from the device to make room for the new ones.

This is awesome not only for small-storage iOS devices, but also for laptops: I love being able to carry around my "entire" library on my Mac without also having to lug a 500GB external drive for that library's full-resolution Raw photos.

Secure, strong backups

While iCloud Photo Library's primary goal may be to provide you with the same library on all your devices, it also keeps a copy of that library safe and secure in iCloud using Apple's CloudKit framework. In the unlikely event of a hard drive malfunction, waterlogged iPhone, or other hardware disaster, your images will be safe and sound and ready to redownload.

The cons

For all that I like about iCloud Photo Library, it still has its flaws: For me, they aren't dealbreakers, but they might be depending on your needs.

The iCloud storage cost

Though Apple's iCloud storage costs are lower than they've ever been, they're still not as inexpensive as their rivals. Apple doesn't use advertising or data brokering to subsidize the costs of storage, but for $10/month, you can only get 500GB of storage in comparison with Dropbox or Google's 1TB, or Amazon's unlimited storage option with Prime membership.

For me, the ease of use on my iPhone and Mac outweighs the extra expense, but it still seems like a poor play from Apple if the company wants the majority of its users to use iCloud Photo Library with Photos for OS X and iOS.

You can't choose not to sync certain photos

CloudKit is incredibly secure, but even so, there may be some images you'd prefer stay offline — whether for job or personal reasons. Unfortunately, iCloud Photo Library is an all-or-nothing affair: If you want those photos offline, you'll have to move them out of Photos for OS X or iOS to do so.

It's tied into Photos for OS X and iOS

If you're a die-hard Lightroom user, iCloud Photo Library won't help you — it's designed solely to work with the Photos for iOS and Photos for OS X. And given that Photos for OS X doesn't currently support a good external editing workflow, that may end up being a dealbreaker for anyone who wants to do pro-level editing but have those edits sync across their iOS devices.

There's also the question of reference libraries: Officially, iCloud Photo Library doesn't support syncing with a referenced (external) Photos for OS X library, because of the potential for sync conflicts. There is a (cumbersome) workaround that involves multiple libraries and turning iCloud Photo Library on and off, but it may not be worth it for people who regularly need access to referenced images.

Bottom line

For me, iCloud Photo Library is an excellent way to bring my images and video to all my devices, albeit a slightly-more-expensive one. It boasts impressive sync capabilities, offline photo access, and easy management and backup, even for gigantic libraries. But it also has a few caveats that, while not dealbreakers for me, may be for others. For those unsure what camp they're in, hopefully I've cleared up iCloud Photo Library's pros and cons to help you make the decision that's right for your workflow.