>> After some rather worrisome reports from NASA, we have
>> decided  as a
>> company to NOT
>> use lead-free solder and fluxes on my clients' products.
>> We haven't
>> regretted it, either.
>
>Non -ROHS compliant is not an option is some cases - such
>as when selling in Europe.

Even in Europe, space instrumentation has an exemption from RoHS for 
soldering ...

>Tin whisker growth can become a crippling issue in such cases.

And you do not need to be in a vacuum either. The vacuum possibly 
accelerates the whisker growth, but is not essential. 

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