David from Prosoft support here--
Even though Drive Genius is an award-winning product which Apple uses at the Genius Bar, there are always some cases that Drive Genius and other utilities cannot repair/fix. In these cases, many users will try different tools since they all go about trying to repair the issue in slightly different manners. We've heard of Drive Genius working when other tools didn't work and vice-versa. It depends on the unique situation (all drives and their corruption are unique). As strange as it sounds, we've also heard of corruption being cured after multiple attempts and therefore we do offer that up as a possible solution on a case-by-case basis...