I needed a thicker paper because when using 20lb images printed on one side were partially visible on the other. The 24 poind is thick enough to prevent that from occurring.
I have been using 24 pound paper in my printers and find it feeds much more reliably than 20 pound paper. And gives your printed documents a better "feel"
This paper is pretty expensive and printer ink tends to smear a bit for longer than on generic printer/copy paper. However it does make everything that is printed on it look sharper and more professional.