RANSKY Be careful - I downloaded and installed Onyx on my Macbook and afterwards my hard drive would not mount (computer could not execute startup). When I ran the program, the initialization routines said the hard disk needed repairs, and to use the Leopard install disk disk utility program. The utility program said the drive had an invalid node structure (or something along those lines). Up to this point, my hard drive and computer had been working fine. I do not believe it was coincidence. I was able to recover the drive with a restore from my Time Machine backups, and it's running fine now.
(Version 1.9.9)