The Betty Crocker Chocolate frosting is the only readymade cake frosting I find acceptable for use.  I am old enough that frosting mixes were introduced while a child, and readymade frosting was not available until I was well into my adolesence.  Thus, I learned how to whip up a cake frosting with little trouble or effort.  However, now days, even that little bit of effort is more than I have in me.  For those occassions, I rely on a can of this.  It is also good to use to make what we called quickie sandwich cookies back in my college days:  a graham cracker split in half filled with a generous dollop of this frosting.  (Very good for sustaining the scholar while studying for finals.)