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But it's still expensive and based on what atx said above, the SM is heavy like a brick...
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That expression is more figurative than literal.
The sr71 weighs just about the same as the SM, but the SM "seems" to weigh more because it's smaller and your expectation is different for smaller objects. The portaphile is about half the weight of the sr71/sm (probably less but I don't have a scale).