Cost estimation using CostX from a Revit model

I will be providing a model and Cost estimation needs to be done using CostX.
Then elaborate on the advantages and challenges of taking off in CostX compared to other tools available.

Link to revit models:
https://www.dropbox.com/sh/a94dafqicuiwr10/AAAOHQWMrWUID6NU07J8B86pa?dl=0