This appears to be a new and very small company. That doesn't rule it out but I'd make sure to buy all the spares I needed up front and not assume any charcoal filters will still be available for it next year.

I would think that any .015 micron filter that has water freeze in it silently becomes a 15 millimeter filter...

Even dry I'd wonder about the thermal expansion coefficients on the materials used with such small features. The max rated temperature is only 140F - too low for storage in a car - probably because of thermal expansion issues.

That's probably true for *any* high-grade filtration system - they need to handled as though they are high-precision machines, which they are.