Does the job well
I spent two months sleeping in this tent while hitchhiking through europe with a buddy.
For light weight, ease of setup and take-down, functionality, durability, and simplicity, this is the greatest tent i have ever had the pleasure of sleeping in. The tent took a beating (we pitched it everywhere from Irish mountaintops to Spanish parking garages) with nary a tear or loose thread. The zippers pulled snag free every time. The ventilation was effective - I never felt like I couldn't breathe in the tent, as I have in many single and double-walled tents. I have a hunch the bright interior played a role in keeping our morale up throughout the two months. By the end of the trip, I was questioning the value of houses: why not live in a tent for the rest of my life? I would live in no other tent but this one.
I'm 5'11" and my buddy is 6'. We were able to sleep in the tent with our backpacks on rainy days (which there were a lot of). It was admittedly cramped, because our backpacks were huge, but cramped can equal cozy with the right mindset, and I think backpacking in general requires a certain psychological shift that makes you more open to discomfort in exchange for freedom/exploration/escape/whatever reason you are camping to begin with.
The tent leaks in heavy rains. We dealt with it, but some may not want to. Those who say this tent is meant for alpine-style summit assaults are correct-it's better at sheltering you from dry snow than rain. However, if you're not afraid of a few drips, this tent is great for extended backpacking trips. A waterproofing fabric treatment is something else you could look into, however do your research because chemicals in waterproofing treatments could theoretically compromise the integrity of the fabric.