I have just completed a 100 mile section of the PCT in Washington using Yama's Cirriform tarp and love it! At 6'4" I had Gen add 4" to the length (and to the 1.25 shelter as well; bought both same time).
My first tarp was an Oware sil flat tarp. Even though there are multiple configurations with a flat tarp, I discovered that I only used an A frame. I enjoy the sharp look of a catenary tarp and knew cuben would handle the rainy PNW better (doesn't absorb water like silnylon), so my next tarp was a MLD Grace Duo. Fantastic tarp, lots of space, but I found that on rainy windy nights, I wished for a little more protection in the front and back.
So, briefly, I considered MLD's Patrol Shelter. But on those dry clear nights I knew I'd miss having a wide open view that the Grace Duo provided.
Then I came across Gen's Cirriform, offering the protection of dual beaks AND AND AND with the front zipper, the possibility of opening it up and enjoying a full view. As far as shaped tarps, it seemed perfect.
Then I contacted Jeff Sims and he confirmed that the Cirriform was top notch. He loved it. So I put in my order, had Gen add 4 inches in length, received it a WEEK later (amazing), and after a 100 miles, I can indeed tell you that I love this tarp too.
For Section I of the PCT, I brought my MLD bivy and the Yama 1.25 bug shelter. I wanted to try both and see which I liked better. In a few days I'm headed back out to complete Sections J & K and have decided to carry the bug shelter. I'll use the bivy this fall and winter.
And therein lies the beauty of this set up: versatility. Together with either a bivy or bug shelter, it makes a perfect combo.
Now, as far as space, it wasn't as wide as my grace duo. That's probably the only thing I miss. But it did rain 3 nights on my trip and I can say I'm glad I gave up that side space for beak protection. Plus I've learned to be a bit more tidy with my gear and that helped me get on the trail quicker in the morning. Some of the camping spots were fairly narrow and I appreciated the Cirriform's leaner footprint.
As all will tell you, there are compromises to every shelter. Their features are not as important as understanding your own personal criteria. It took me awhile to discover that bit of truth.
Hope my two cents helped. Feel free to contact me with any questions.