You can combine them with Quartz into something good and practical to use. Quartz offers better representation of cast bar and buffs/debuffs at target and focus frame. For my moonkin Quartz offers mainly better overview of various DoTs placed there - it's easier to see them fading and requiring renew.
Main reason for switching to Satrina Buff Frames was for me need to list buffs and debuffs as one line atop of the screen (i just love lot of free space) with better visibility of debufs. And SBF does it marvelously.