The reason why many people don't like DJ3 is because when it was first released it had problems writing CDIs that were made using DJ2. That has since been fixed and is stated on their website as feature of the new version.
I've never even heard of any other boot disks besides Utopia Boot Disks. Of course I may have just not noticed either. Utopia worked fine for me so I moved on to the next step and didn't look back.
