Scalability-wise, there is one issue we encountered that I want to mention. At some point, Imperva, moved their account takeover prevention features from the on-premises edition to the cloud-based edition, and we discovered that this step would take yet another integration, seeing that we were using Imperva on-premises. These account takeover prevention features, however, were already part of our subscription, but since the features moved to the cloud, we missed out on them. So, in this sense, I would say the scalability strategy isn't as solid as it should be, and for this reason I would rate the scalability a 3.5/5. On the other hand, when it comes to how many users we were able to scale up to, we actually had the whole organization using it, including around 3,500 clients in total.
