Spring Drive movement reliability

[RamyAshour]

I am strongly considering getting my first Grand Seiko which has a Spring Drive movement, and I am just wondering about the overall reliability. Mostly in terms of extreme weather temperatures due to its electronic regulator. Would it be largely unaffected if I go skiing in Norway at minus 25 degrees celcius, or go to Death Valley at 50 degrees celcius heat? Sorry if this is a stupid question.

I was recently at the botique in Los Angeles and they told me that in general the Spring Drive movements are very reliable, and service is not to be expected before 10 years

Just wondering if temperature will have any affect on precision.