Dave,
The SKB case has a purge valve, so hopefully the condensation won't happen. At lowered cabin pressures, the humid air should vent into the cargo hold before condensing. I believe it to be a two-way MIL-Spec valve, so the case won't be "vacuum sealed" on the other end and impossible to open.
I only got this case for potential trips. I keep a Taylor 114 in Anchorage, where I fly 85% of my airline trips anymore, so I don't have to trust the baggage system. I actually have had good luck with gate checking in regular hard cases. I always ask for the color ticket (brings the gear back up to the jetway like stroller or wheelchairs) instead of the white ticket (they hand load it into the aircraft, but it comes out on the conveyor system.
Earl ASEL, ASES, instrument rating, 1400 hours PIC time in Alaska