The documentary is finally online for us peasants. Just finished watching it. Most of the interviews are in German so don't forget to turn your subs on. The feature's not bad but it really should have been so much more. The xenomorph stuff only lasts for about 5 minutes and they don't even mention Sil or Species. Giger himself really looks like he's at Death's Door - can barely walk and talk. Even for a German speaker, you'd be hard pressed to understand what he's saying through his mumblings had it not been for the subtitles. Seeing the train in his back yard and seeing him attend the press events was the highlights for me. I think the documentary could have really done with some narration in English.
So yeah, only for the hardcore Giger fans. I guess if you want the whole xenomorph experience, go watch his older documentary, Giger's Alien.