Ive used the CS2 for my daughter (5 foot nothing) and myself (5'8"0 on the JMT. The first night we were out, there was a huge thunderstorm with torrential rain and hail. We were about a mile north of Duck Creek at about 9,500 feet, in some tree cover. There was about 4 inches at least of hail buildup on the sides of the fly after the storm. The tent did great - no leaks, didn't hear any flapping (but the hail was very loud). I like the side entry, ease of setup, large vestibules that kept our boots and packs dry, bathtub floor that prevents drafts once you're lying down. When we camped on granite or no place to stake, it was easy to use rocks to anchor the tent at the guyout points. I always stake my tent, but the only places you have to stake this are the vestibule. Staking out the guylines at the ends is optional, tho it gives a bit more room - but nothing like on the Fly Creek where its really mandatory to stake out the fly.
Ive also used the CS3 for 2 adults and my daughter - a little cramped but fine.