I would say it’s more successful than not. I’ve not used it personally since I never had any CentOS systems to convert. If you are mostly using standard packages from repositories like CentOS or EPEL, then I expect it shouldn’t be too problematic. If using some exotic repositories that aren’t common or packages installed outside of repositories (manually downloaded), then problems could occur.
If it’s a VM, make a snapshot before starting the migration. I would also ensure a backup of data just in case.