I agree. The land shark is a robust emergency survival bag; heavier, stiffer, and more durable than anything else I've found in this category. If you can discount the weight, size and price limitations, the land shark should be the best in show. One of us will review it soon I am sure. Right now I am too busy relocating to give it a go, but come February, I plan on placing an order with land shark.
However, this new heatsheet looks full of promise. It may not be reflective like the bivy bag or the mylar, but if it will hold up better, it should be quite suitable as a protection against the wind and rain. Poly U should hold up against heat better than Poly E or Poly V. I reckon I will have to get me one or two of these now as well. So much for my garbage bag days. Oh, the burden of making a better living....
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)