What's it like to fly in and out of Aspen (KASE)?

I've been flying in and out in simulation and it seems challenging. It makes
me wonder what it must be like in real life. What are the most distinctive
characteristics of the airfield? Is it as challenging to fly into or out of
in real life as it seems to be in the simulator? Just the list of remarks on
AirNav for the airport sounds a bit ominous.

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