Debian Japan and updates

[Paulo Henrique Baptista de Oliveira]

        Hi Debian users,
        recently I download XFree86 3.3.3 from Debian Japan project. I'm asking
if is safe to install these packages? What about put a line in 
        /etc/apt/sources.list
        to point to Debian Japan?
        They seem to be very fast updating packages...
        Have a nice day,                Paulo Henrique