It is indeed a VCS of its own. We think superior and more complete that Git and we make a living from it. These are some of the reasons why:

https://www.plasticscm.com/git

Bur sure, if you's like to, you can work with Git repos without any trouble (Plastic SCM has the same idiosyncrasy Git has):

https://www.plasticscm.com/gitsync