Similar to the other responses, it's the fact that I can manage my network remotely from a simple app or UI. This helps me answer phone calls from my family asking why Netflix doesn't work on TV #2, when I'm not at home. Won't solve all problems, but at least I can narrow it down and troubleshoot.

And I like the fact that I can an overview of the state of my network; one of my wired links to an AP would degrade to 100 Mbps at times, and being able to see the link speeds easily was very helpful (it was a bad ethernet cable in the end).

Before I moved to Ubiquiti I had a spate of problems with my fiber broadband, which would stop working for a few minutes at random, resetting my RDP connections. I had a vendor-supplied Linksys (I think?) router, and trying to troubleshoot it was painful. If I ever have such problems again I'll have much better diagnostics.

That said, I won't buy any Ubiquiti gear that requires the cloud, and my faith in the company is eroding. But, like others, I would be at a loss what to replace my gear with at the moment. I just hope it'll function well enough until either Ubiquiti gets it act together (again?) or a viable competitor arises.