The solution's scalability is good. You can add as many access points as you want. But changing the security package is hard once you've bought it. This is more of a problem with the legacy ones. The new ones are a bit different.

Awesome! You can manage it all from one single portal.

This is a scalable solution. 

It is fairly scalable. However, you have a limitation there. I guess, if you're trying to add more power to one location, you're going to need a more powerful access point. So you might think about buying a larger one, and that's just the harsh truth about buying hardware.

This solution has unlimited scalability potential.

The solution can be scaled but it has limitations from my experience. The access points are rated for 500 people but I think the max is closer to 200.