I used the Quiltsmart interfacing to do my Lone Star throw, and was so impressed that I bought the kit for the Broken Lone Star quilt. It is easy once you get the hang of it. I liked working with rectangles of fabric instead of stretchy diamonds, and its easy to get into a rhythm of glue, stitch, flip and fuse. The interfacing does add a bit of weight, but it is really thin and I really don't notice it on the finished throw (even when I free-motion quilted it.) I posted the throw here:
http://www.quiltingboard.com/posts/list/5650.page
I have a couple more of the kits, but haven't done them yet. I'm definitely a fan of the method tho!