Jelly Rolls or 2 1/2" strips as other manufactors call them are great for certain projects. There are many great quilt design that call for "jelly rolls". These rolls have about 40 strips of coordinating fabric - so the coordinating is already done for you. The thought of picking 40 different fabrics gives me a headache. also I think that they are actually cheaper then buying 1/4 yd of 40 fabrics ( 10yds x $10 = $100) as compared to about $35 for rolls. I recently bought a roll and was delighted with variety of fabric in it. Patterns I would not have chosen by myself.
I have not used anyother precuts.