I've been developing websites and plugins with Kirby 2 for 3 years and have had a great experience with it. I find it great for building custom websites. Clients love the simplicity of the Panel too.

Kirby 3 is a huge step forward. Some of my favorite new features are:

- New Panel powered by Vue.js

- Panel tabs & sections

- Better plugin API

- Built-in REST API which allows it to be used as a headless CMS

- External data sources

- Asynchronous media API

- Better cache system

- Simpler language management