It seems quite interesting.
I would have definitely proposed it to my company, but unfortunately the per-seat pricing is a no-go for us. We are having flexible teams, and we often change people per project or hire from contractors so the user management can quickly become a mess on per-seat projects.
We will end-up creating some shared accounts to save on costs, and it will become messy to manage, some people will be denied access,... so unfortunately we will need to pass.