The scalability is okay, but it's not as good as Tableau. One of our customers does plan to increase usage in the future. However, they may choose to increase usage on Tableau as it's easier to use and they would be more comfortable using it.

I have not experimented with scalability.

It is definitely easy to scale. Even when moving between the different versions, you have the ability to export your previous setup of reports and import it to the new version. And if you want to set up on different nodes, it's actually quite easy.

The platform can be expanded but it is not easy. While doable, it is somewhat complicated to scale. The number of users differs depending on the client, but some of my clients have approximately 1,000 users. It really depends on the size of the organization.