What does Kinsta do well? The best thing about Kinsta is that whether you are on their "starter" or "enterprise" plan you will be using the same premium Google cloud Network (unlike WP Engine). Kinsta is super fast and provides free SSL and CDN with every one of their plans. Their blog is also very good with a bunch of relevant content in WordPress.
What does Kinsta not do well? Kinsta only allows 5 manual backups on my plan per week. Sometimes I wish I could took a backup every time I made a change on the site but probably not necessary as I already receive daily backups every day anyways and can purchase their add-ons to get more.
What do you wish you had known about Kinsta before using? How fast their sites are and how much they value being transparent with all their plans, features, and packages. I also have bookmarked their blog as a bunch of good articles and tutorials that I use.
Have you used a competitor to Kinsta? If so, how does it compare? Yes I have used WP Engine, Flywheel (recently purchased by WP Engine), GoDaddy, SiteGround, etc. Kinsta is the fastest I have seen of all the managed WordPress providers and a no brainer for anyone that wants to host their their site with WordPress.