I've just bought it but haven't really used it yet so my info is going to be limited. Anyhow... AFAIK it can't generate rain or fog. Or rather, it probably can but that would be at horrendous cost to resources and Poser would probably have conniptions with the squillions of separate objects in the workspace. You're probably better using Atmosphere for fog and transmapped squares for rain. What it actually does is take a prop (any prop) and create repeat instances of it in the Poser workspace. The instances can be positioned according to different X Y Z values, calculated by adjustable formulae. You can add textures or materials or any Poser surface effect to the props, scale them, add more particles, rotate and generally mess around with them until you have the desired result. From what I can see, it's worth the money but may be of limited use. I can't see a need for it in every render but I think it will add some extra pizzazz to certain images. FWIW, I had the original version but never used it. This one seems much easier to get to grips with. Sorry I don't have any sample renders but I hope the info helped.

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