I don't usually buy precuts as I do mostly large planned quilts. I have a shoe box of fatquarter that I have been given either at quild or shop hops, etc. I bought one charm pack (Elenor Burns design) that I really loved the colors and made a table runner for our quilt auction at guild. I have a layer cake that I will add to and make two twin size quilts out of (It was on sale) and I have a jelly roll, again I really love the colors and love the pattern that went with it.
Most of the time I don't like many of the fabrics in the packages and because I am a perfectionist I don't like charm pack because they really aren't 5" square. Also the price is usually a lot more.