The skyair is very similar to the Patrol Tarp, by Mountain Laurel Designs. Lots of people love that tarp.
I dont own either the Skyair or the Sheep tarp, so this is just my opinion. I looked at both extensively, as a backup/emergency shelter. I live/hunt in BC, so it is exclusively for getting stuck out after a long day of hunting, too far from camp to make it feasible to head back. So max 1 night....probably in poor weather. Because of the poor weather aspect, I decided I wanted something more then a flat tarp as I didnt want to also hike with a bivy. The flat tarps really dont work for me in rain/sleet/wind.
I'm currently looking at ultralight tarps that are more enclosed, closer to a tent. Skyair, Patrol Tarp, Yama Mountain Gear Cirriform, Seekoutside Silex. I'm also leaning towards DCF over Silnylon. If the Skyair was made in DCF, I would own it.
The flat tarps I'll keep more for day use for shade and maybe a passing rain shower or summertime backpacking. But not overnight, as I feel they need a bivy to be effective and for an emergency shelter. I dont want to have to carry both.
Again, this is just my opinion, based off other similar tarps and tents that I've used.