Most users probably won't consider the idea of defragmenting their hard drive. Apple claims it's unnecessary, and basic defragmentation is handled by the OS. However, if you move a lot of big files, iDefrag is a good option. It's completely dependable using the convenient "online" option; running it from a disk is easy, but the full defragmentation algorithm may take some time.

Customer support provides clear assistance within a few business hours, and it's easy to feel safe with the software.