ey can easily be carried from place to place. One of the bad things is that more surface area of the CD is being touched. I use the sleeves because I have over a thousand CDs. There is just no place to put them if I left them in cases. I also find that I listen to my music more because its easier to locate what album I want to hear. My opinion is, if you by the books get the name brand like Case Logic. Ive had bad experience with other brands because of poor design. An example of this is CD Projects. They had a plastic lip that is supposed to hold the CD in better. I found out that this lip scratches the CD each time I took a CD out. Also, it was almost impossible to put the lip over the CD. You should just go ahead and pay the little extra money and get a good quality book....