The Virginia Cyber Range (www.virginiacyberrange.org) is a taxpayer funded organization that leverages this project heavily to give K-12+ students access to virtual machines for cybersecurity education.
Some of our customers are on Chromebooks, but with this they can access machines without installing software.
For students at home, it's the same experience, no need to provide at-home setup instructions for all the common operating systems.
In schools using computer labs, no need to install software at all.. IT admins see Guacamole's requirements for service and it requires them to do no work, and opens no threats to their network.
This allows us to replicate the capabilities of virtual box or similar software without teachers needing to know anything about virtualization, or dealing with the first session/week being the struggle to find BIOS flags to turn on, and getting the virtualization software working.
We currently see about 500-800 unique guacamole connections per day, it's fairly reliable.