Yes, I installed mandrake 9.0 on a box behind my firewall. It had red hat 7.2, then trustix 3.5 on it before, the latter of which turned out to be rather too secure, with too much porting required to make it convenient for my uses. That PC is mainly a development and
test box.
I used mandrake 7 and 8 before, 9 seems to be the logical progression. Nice features, up-to-date packages etc. I like the ease-of-use in Mandrake, I can trust the installers to install properly, and I can then get on with my work without having to tweak too much.
And Mandrake comes on 3 disks with lots and lots of packages, everything that I've needed to install (except the latest
java sdk which I'd get from Sun anyway). I'd say that Mandrake 9.0 is a very complete and flexible distribution.