I used 6 stakes. I put 2 to stake out the vestibule, 2 to stake out the corners near my feet, and 2 to stake out the sides of the fly.
Using those 6 stakes, I was moisture-free all night and woke up with a dry sleeping bag. While trying to put on pants, I did get a little bit of condensation dripping through as the fly touched the net.
Then, I got out of my tent and removed the stakes from the ground, and the fly touched the net everywhere, and the netting picked up all the water. I took the fly to my porch to dry and I left the net tent in the backyard to dry.
But don't misinterpret this as a critique. I've done enough winter camping to know how condensation forms in a tent, and it got down to the 30's last night. I'm thrilled with the tent; I think it's great.
I also want three more stakes, but MSR Mini Groundhogs come in packs of 6... so I'll do it later.