I really like using jelly rolls for quilt projects, and many of the classes I enjoy call specifically for one or two of them. I have found, though, that I really have to be watchful since different jelly rolls are slightly different from other ones: recently I bought one that was actually closer to 2 3/4" wide. Every strip I used had to be trimmed down to 2 1/2" before I could sew it into a strip set. The other one in the project was exactly 2 1/2" to begin with. Since I am hooked on batiks, jelly rolls seem to give me more variety than any other precut. This seems to boil down to what I hear from so many other quilters -- do what makes you happy.