Debian-based GUI distros

[Michael Hipp]

There are several respectable Debian-based GUI distros. Does anyone know 
which of these retain compatibility with the Debian repository? I'm 
thinking of ...

- Libranet
- Xandros
- MEPIS
- Ubuntu
- Knoppix
- UserLinux
- Others?

My impression is that Libranet and maybe UserLinux are the only ones 
that retain "guaranteed" compatibility with the Debian respository. 
Anyone know?

Thanks,
Michael