505 is awesome! I just love it!
I've only used Sullivan Basting Spray before the quilt I'm currently working on. The difference between Sullivan and 505 is amazing. With Sullivan I had sticky needles and stiff spots. Nothing like that with 505, it is smooth as butter.
Jhittle has the best price for 505, and gives a discount when you buy 6.
http://jhittlesewing.funoverload.com...new_items.html
I've used basting spray for all of my quilts, I tried the tacking thing, the pinning thing, and the thread basting thing, they all drove me crazy. Basting Spray and especially 505 was miraculous to me! :D