If you want to sit up inside, a taller pyramid might be better. My buddy and I laid down during the afternoon hail and rainstorm.
The bottom of the Speedmid is 9 feet square, and it is set up with a 4.5 foot pole, so the sides come up at almost exactly 45 degrees.
A Black Diamond Mega Light or an MLD Supermid (or Oware, etc.) use a taller pole which makes them roomier. I have heard that these work for three people.
If you are going to open the zipper in the rain, move some gear out of the way and do it quickly. I had the foot of my sleeping bag towards the door and use a breathable bivy, so that wasn't a big deal for me.
The tent was very stable and comfortable in the storm. It wasn't really windy, but it was an exposed camping site. It just occurred to me that I never thought about the wind against the tent, even though there was a constant breeze through the small space at the bottom.
No condensation, though it was 40 degrees and raining.
The rain kept me awake for a while at 3AM because the tent fabric was so close to my head. On the other hand, rain on taut tent fabric is one of my favorite sounds. It reminds me that I am inside and dry.