What does the company do well? I would suggest it to any business/organization who is looking to set up a Wordpress website. WP Engine is the #1 platform for hosting Wordpress websites. It is feature rich and can't be topped.
What does the company not do well? Throughout my experience so far using WP Engine for several websites I have no true 'red flags' or bad experiences using this product. Truly it is the best option, and its not that expensive compared to similar hosting platforms.
What about the company do you wish you had known before purchasing? I wish I had known some of the capabilities sooner so I didn't waste my time trying to use other hosting solutions for years.