The Copy Android app does a great job of helping you manage the files you've stored in the service. Within the app, you can organize your files and folders by renaming, moving, copying, and deleting them. You can also download files and even entire folders to your phone. Dropbox, Google Drive, and OneDrive won't let you download whole folders to your device, so that gives Copy an edge.
If you don't want to download a file, you can simply choose to open it in an appropriate app on your phone, such as Quickoffice for documents or Gallery for photos. You can also share a link to your file in Copy over email and social networks.
For a layer of security, you can turn on passcode protection in the app. That means you'll need to enter a passcode before you can open the app and access your files.
Copy comes with a photo backup feature, called PhotoCopy, which automatically uploads any photo or video you record with your phone to the service for safe-keeping. You can turn this on in settings, and the default setting is to upload those files only via Wi-Fi, though you can change that so they'll get uploaded using your data connection instead.
PhotoCopy used to have an annoying problem that, when you downloaded an image from Copy onto your phone, the app would then immediately re-upload that image into PhotoCopy. Luckily, that issue seems to have disappeared in the latest update, and that's a huge improvement. That glitch was of the reasons I was considering ditching Copy for something else. Now, I'll likely keep using it.
Copy has also made several stability improvements in the app recently, including fixing a bug that was preventing files from uploading. However, the most recent update got rid of a menu that would show you past and current file transfers. I found that menu helpful and hope that Copy brings it back.
Copy is an all-around solid choice for cloud storage. It's affordable, it comes with a generous 15GB of free storage, and it syncs files across devices easily. There's not much bad to say about it, since the website, desktop, and mobile apps are all cleanly designed, and you can share files with your friends or co-workers without eating up too much of your storage space.
After using it for a few months, I believe it's just as good as Dropbox, if not better. I don't have any plans to switch back. If you're just starting out with storing your files in the cloud, or you want a change from what you use now, I highly recommend you give Copy a try.