I spent a windy night at Iceberg lake (12,500') on Mt. Whitney recently in the Hilleberg Akto.
PROS: The guy-system is great, flapping was minimal, even with 50mph gusts. Setup is a snap, even in windy conditions. Cooking/storing my pack in the full size vestibule was sweet.
CONS: With spindrift flying everywhere, I had to keep it zipped up. Venting was not so good. I woke up to a frost-covered interior which promptly dropped on everything inside the tent whenever I moved. I improvised a "frost squeegee" out of my baseball cap which worked pretty well. I read on Hilleberg's site that venting is improved in this year's model and it's also lighter. Inside space is pretty minimal but you're out in the Mountains to climb, not sit comfortably in your tent, right?
