I only have the 12. After reading this thread, I might consider getting a 9 for warm weather. But it sure is nice taking a hike in hot weather and coming back to camp and laying in my snipe with the 12 in porch mode. Keeps the sun off you but lets any breeze in. Nap time.....Plus the 12 lets you easily cover up other stuff besides your hammock, ie. your pack, camp kitchen, etc.
BTW, has anyone ever sprayed their Kelty tarp down with anything (Nikwax, etc) to keep it waterproof? If so,what has worked for you?