I must admit, I don't know much about the Terragnosis or their game, Sulphur. Looking at their website it seems to be a mix of Gothic Sci-Fi and Post Apocalyptic Skirmish gaming. The rules are a free download and I will be reading them in the near future.
There seem to be some interesting miniatures in their range (some are a little too Sci-Fi for my vision of the Apocalypse), but there are some very interesting pieces too.
Of particular interest, are the three quad bikes. They all look some what hashed together and primitive, which is perfect for a PA game.
These next minis would be ideal for anything from a desert setting to a wintry snow covered one.
I am not quite so sure about this one, but it may well work really well once it has some paint on it!