I own a 12 - it is huge and great for winter or two people under it at a time.
In a diamond configuration you need some wide spaced trees to accommodate which will limit your hanging options. Hanging it on the square (front porch style) it is perfect for my WBBB and is great at defeating wind.
I have never tried the 9 but imagine it would be great setup as a diamond.
As I'm sure you know it isn't the lightest tarp but for the money its pretty darn bullet proof and Kelty has excellent return policy if you have an issue (especially if you buy it from REI who has their own amazing service)
I've "bear burrito'd" two hammocks at once in this thing in high wind conditions on a lake in Vermont. Worked great and kept my wife and I nice and warm.
at Jennifer's Tea Garden
( My Wife's Place
Last edited by XexorZ; 11-29-2010 at 22:19..
Reason: Me fail english? That's unpossible!