Terraform v0.9 only handles remote state and locking properly. Handling multiple applies of state is something scheduled for 0.10
Basically terragrunt handles some stuff today in a less robust, less portable, way that your team is likely to need today -- whilst waiting for core terraform support.
(disclaimer: I follow terragrunt and terraform very closely but do not actually use terragrunt in producution anymore).
Terraform v0.9 only handles remote state and locking properly. Handling multiple applies of state is something scheduled for 0.10
Basically terragrunt handles some stuff today in a less robust, less portable, way that your team is likely to need today -- whilst waiting for core terraform support.
(disclaimer: I follow terragrunt and terraform very closely but do not actually use terragrunt in producution anymore).