I've been playing CMSF as much as humanly possible since I bought it 5 or so weeks ago, and I'm now giving some thought to buying the Marine module. I do have some questions about it though.
Apart from the obvious (new unit, new equipment, new campaign), how does the Marine module differ from the stock game? Does it introduce anything new, tactically? Different mission types, or enemy types? Or is it essentially "more of the same"?
I will almost definately be buying the Marine module no matter what the replies, because I've seriously enjoyed CMSF so far and like to "reward" developers who develop games I enjoy.... but I'm curious about how it differs.