I am a frequent user of both DiskWarrior and Drive Genius. I'll run things like defrag (Drive Genius) or rebuild volume directory (DiskWarrior), on average about once a month, to keeps things running smoothly. I have no experience with SSDs, but have one on the way, so I apologize if this seems like a silly question. With the things that SSDs do in the background, like overprovisioning and garbage collection, do these types of old school disk utilities still have the same benefits? Can they actually cause harm? Or are they simply not needed? Any info is appreciated. Note: I posted this in the MBP forum not only because that's where my SSD is going, but also because this seems to be where the majority of SSD discussion is taking place.