Hi jerseydave, living in Australia, at least where I am, I don't have the extra 4th season that alot of the tarps are designed for. So really a 3 season tarp will cover all 4 seasons I experience here. (Hope that made sense)
I own a WB Superfly, new model with inbuilt doors, and until I get the funds to buy a OES, I'm using this as my one and only tarp, and it works very well for that IMO, as if I get bad weather, the superfly can handle it, if its nice weather, porch mode/no tarp.
here is a photo I took a little while ago, you can see the difference between the superfly and the blackbird in their stuff sacks.
just click for the bigger image
http://i830.photobucket.com/albums/z...h_SAM_0246.jpg