I've been using it for about a year, and I have absolutely no complaints about it! I'm still quite surprised at how high-quality the free image uploads are. I think of it like iCloud photos on steroids. My family, with mostly iPhones, can view all of the pictures I send them, and they can see mine.
Free unlimited storage
Non-destructive built-in photo editor
Not a lot of free storage space for high-res content
Files may be compressed if you're using the unlimited storage option