“When asked about the advantages of Skolelinux/Debian Edu, Nigel Barker replied: “For me the integrated setup. This is not just the server, or the workstation, or the LTSP. It’s all of them, and it’s all configured ready to go. I read somewhere in the early documentation that it is designed to be set up and managed by the Maths or Science teacher, who doesn’t necessarily know much about computers, in a small Norwegian school. That describes me perfectly if you replace Norway with Japan.”"
That has been my experience using LTSP and Debian GNU/Linux. The advantages of having everything in one place compounded with the efficiencies of file-caching and the performance of a good server with Debian GNU/Linux are too good to ignore.