What does the company do well? WPEngine provides the best managed WordPress hosting experience. It is very easy to create staging environments and restore from backups. There are countless occasions when I needed to restore the site to a previous version. WPEngine's easy backup and restore always comes to the rescue.
What does the company not do well? I have not had any experiences with WPEngine where it would have failed to come through but it's a bit pricey.
What do you wish you had known about the company before using? I wish I had known that they have a free site migration plugin. It works really well.