I do love them all. Jelly rolls are 2 1/2 strips of a particular line of fabric or a roll of blue fabric for instance. Charm squares are 5 inch pieces of fabric from a line and layer cakes are 10 inch pieces of fabric from a line. I have used them all and I absolutely love them. Eleanor Burns might design 35 fabrics in a special line and they will have one piece of each fabric, sometimes 2 of a few and sometimes all might be different. I just made my DGS a quilt using Benartex Bali Dark layer cakes and there is no way I could have cut the 10 inch squares from all those fabrics. But I bought them in a layer cake and got them all. Same goes with charm squares, you get 40 different fabrics and mix them with a background, sashing and cornerstones and you can make a beautiful quilt. I think it depends on your quilting style if you like them or not. I have had tremendous luck in making some beautiful quilts with precuts.