Oh my goodness. I bought the 505 upon the recommendation of several ladies on the board, and WOW, what a difference. I'll never, ever, ever sandwich another quilt without it. Absolutely amazing stuff.
I taped the top to the kitchen floor, taped one edge of the batting and one edge of the backing. 15 minutes later, I have a sandwich ready to go on the machine.
I'm single, so I stretched and smoothed it solo. (It's a baby quilt, so it wasn't anything large...)