We love the ease of use for our staff and students, the 99% uptime, the responsiveness of their support team and our account manager, and Instructure's commitment to improvement.
We also use Canvas in an unusual way, as far as roles, sections, and permissions go, due to having staff in pastoral roles, that many schools do not. Canvas worked with us to find a way to set up our staff that gave them access to what they needed in an unconventional way.
There are some features we would like (broader overview of student grades for certain roles, for example) that have not and probably will never be implemented due to US laws - as a UK school, these don't affect us and it's frustrating to have the US market dominate concerns
As a fully online school, Canvas is essential to us! It's how we provide students their coursework, receive and mark their assignments, and communicate with them. The range of tools and also LTIs available allow to create interesting, interactive and fun courses for students.
We've grown by more than 100% in 3 years, and tools such as Blueprint help us to maintain consistency.