I would rate the scalability a five out of ten. It is not very scalable because scalability depends on the model. For instance, the FortiEdge, which is the entry-level model (the smallest model), supports up to about 15 users. Then the next model supports up to around 30 to 40 users, and the following one supports a hundred users. The price increases significantly with more users, which can be a concern.
If I make a guesstimate, I'd say about 20 to 30 of our clients, but they all have multiple branches. So, in total, we have about 200 FortiGate firewalls deployed for our customers, spread across 20 to 30 clients.
Most of our clients fall under the medium to enterprise category. We have clients from financial institutions and big corporate organizations. It's not an entry-level solution, as it might be challenging for small businesses to afford.