We summited a couple days ago.
1. It was quite windy in the night. I am not very familiar with Tarptent, but you need something that handles wind well.
2. We left our tents open, emptied out our packs and laid everything loose in the tent (all food and toiletry items in the Bear canister). No damage from rodents. Wind damaged my rain fly however.
3. I didn't notice any mosquitos. I carried mosquito wipes, it was unnecessary.
