It is a very impressive army, lots of good ideas and a lot of great conversion work.
It doesn't quite match up with my visions of the Fremen or Sardaukar either though.
I grew up playing the Dune II RTS game, and then later read the first book, in that game the fremen, while weapons wise are a little off (rocket launchers), they are fully robed up and everything.
The Sardaukar on the other hand, are high tech battle armour, the best the Emperor can afford.
Also the more time I spend looking at real/non-heroic scaled models, which I've been doing a lot of since stopping playing the Evil Empire games, the weirder and more noticable "heroic" scale models look.