Nextcloud 9 is praised for being a robust open-source cloud solution, often described as a self-hosted alternative to Dropbox. Users appreciate its extensive plugin support, allowing for versatile functionalities like task management, calendars, and email handling. While generally reliable, some users note that it can be prone to issues if mishandled by power users. Overall, it is highly regarded for its flexibility and comprehensive feature set, making it a strong choice for those with the necessary server resources.