I like it. It definitely packs smaller (easily fits in the top of my HMG Porter 4400), and I’ve been able to use it on Alpine lakes, the Dirty Devil, the Escalante, Stillwater (Green/Colorado), the Bear, the Provo, and the Weber. I bought a horseshoe seat bottom (5 oz) that I can throw in there, which brings the combined weight to 68-69 oz (again, mine’s 200d Vectran, so maybe a few oz. lighter than the normal model). My traditional 2013 Yukon Yak, in contrast, is about 87 oz with the full seat, so not quite 20 oz savings.
The CY can handle Class II, maybe Class III rapids, but you’ll get wet because of the 10" tubes. While I like it, I’m probably going to migrate to a Ghost for my ultralight trips. I’m only 5’ 8" and the cockpit in the CY is huge (see updated pics in linked folder above). It’s not long, but it’s really wide because of the 10" tubes. I often don’t use all the space, so I figure I might as well go with a smaller boat and get better weight savings and packability for long trips. If you’re not too tall, and you’re only thinking Alpine lakes, the CY might be more than you need. But again, great boat and really versatile.