@Evgeny Belenky, The most expensive hardware they sell (i5-7500 w/ 16gb RAM) is rated for a max of 300 users, you could try running it on your own hardware as they do license it that way but I have no idea if there is a point it will buckle due to coding bottlenecks.

We use it for small to medium businesses who have a need for advanced firewall features but want an affordable solution that has the ability to grow with their business.

Windows Server is the core of most of our small business clients networks, it holds programs and data, allows secure sharing of data, and provides core network services like User Authentication, DNS, DHCP, and File shares.

@Fabrizio Sagrlio I’m confused by your answer as UniFi easily supports Multiple SSIDs and Bandwidth restrictions through the controller dashboard. 

Learn the product before you jump in, it is very powerful, but that means it isn't always easy to manage. Changes can be simple as checking a box, or as complicated as sending PowerShell code, best to know how to use the features you want before you move everyone over.

We use it for the ability to manage and make changes at multiple locations from a single dashboard. As an MSP we manage a lot of networks and driving to each site wastes valuable employee time.

Ease of management and lack of licensing fees.

I'm confused by this question as it is really easy to get pricing and cost info for Ubiquiti Unifi, for price just go to their website. For cost just ask your distributer or if you don't have one buy it off Amazon. Honestly its almost to easy as clients can find out my price…

I can think of 2 Firewalls that should be doing much better then they are, Kerio Control and ZyXEL ZyWall. Both have been around for a long time but have never gained the market share I feel they should have and I often find people have never heard of them.