It's moderately scalable. I'd rate it three out of five in terms of its ability to expand. 

The solution is scalable. 8,000 people deployed across multiple locations with varying insights from 300 hundred to 4000 people.

The solution is scalable although we don't use it to its full potential. 

With respect to scalability, it works until you start talking about cloud environments.

Very scalable for the versions available

It is very scalable.