Use it at your own risk... but know that "cracked" software IS PIRATED software. Cracked also opens you up to dangerous software... I wouldn't do it. Don't know what kind of "help" you're looking for.
Since it's an additional repo you have to add I think he's asking other people's opinion and whether to use it which you've answerd. I wish I could add to it but yeah if you're not sure I wouldn't bother doing it.
The legitimate repos are already in Cydia. Now and then you might need to add a repo for a beta app, but beyond that, there's generally no reason to add a repo for legitimate reasons.