I usually don't do BOM - but this year I am doing one, just because I liked the quilt and wanted to try the various techniques. The only problem I have with them is when I start on a quilt I don't want to wait a year to complete it! But I bought an acid free plastic box to keep the completed blocks in so I don't lose them by the end of the year. If you calculate the cost i really isn't any more than if you purchased all the fabric independently.