Considering this is only for FedRAMP Low/Medium, I'm not sure why any contractor or agency would pick this over AWS GovCloud, where finding people already familiar with the platform is easy.
From their own front page:
> We’re a great fit when:
> - Your applications are Moderate impact level or lower
Because (theoretically) faster path to ATO, which is a huge pain in the arse. That's what all these federal private clouds try to accomplish.