I've used both the mil-spec model that was never released and the production model that is about to be released. I have the production model now. The only difference is the outside. The production model's body is not built as tough as the original mil-spec, but it's still tough enough for all but the most sever battle type conditions. It's a truly fantastic illuminator. There is a review with pictures and video at www.shwat.com. Full disclosure: I own that web site. If you have any questions about it, let me know and I'll do my best to answer them.