What does the company do well? First of all, I love Apple. I really do. I personally use Pages, Numbers, Keynote, etc. all the time. Of the software options out there, I gravitate toward Apple products. They're focused on design and functionality. It looks great, handles great, and is incredibly user-friendly. It is powerful, but simple at the same time. Now with icloud.com, you can even edit online. And if you're on all Apple products, there are incredibly simple remote features on your iPhone or iPad.
What does the company not do well? Sharing is not at the forefront of their plan for Keynote. Collaboration is possible, but it's not at all the most important feature. So it's only decent. It's not NEARLY as capable as Google products in this department, and that means it's usually only for personal projects that I'll use Keynote.
What do you wish you had known about the company before using? I'll come back to sharing here. I wish sharing was a key feature. If I ever need to collaborate on a project, I'll sacrifice design functionality and use Google Slides instead.