I use it all the time to make back ups. Even though it says the clone is bootable, that is in a regular mac.
For your clone to be bootable, you have to run DellEFI to finalize the drive. From what I understand, the very small EFI partition does not get cloned, as it is a separate partition, at the beginning, or first section of the drive. This is where the boot loader resides. You cloned the OS X partition, and if this was a regular Apple Mac, that would be enough. However, since this is a Hackintosh, you have to take additional steps.
If you are trying to boot from a clone, use either a Boot123 disk, or a usb thumb drive set up with the boot loader and DellEFI to make this work.