As a Mac consultant, I see way too many computers (especially laptops) whose hard drives are maxed out with music and pictures, sometimes causing data loss. Till Apple builds something into the operating system to warn users about low storage levels, this is a good choice. I've had it on an iMac G5 running Tiger for a few months now with no ill effects and am planning to make the optional $5 donation. I do not understand why there are no other recent feedback posts here. The complaints all apply to older versions of DriveGauge. As to features, personally I don't care about all the cosmetic tweaks provided--just a basic visual gauge is all I need so I stuck with the default icon and settings.