I also have a bunch of EdgeMAX because I use the L3 features, they were more expensive, and that range is sadly now discontinued, but the Unifi equipment have all been workhorses, and the only think I've ever had fail in the past decade was an EdgeRouter Lite, the power circuitry failed after some dodgy mains voltage issues in my previous home.
These are handy but I've never had one successfully be adopted by Unifi. No idea why. And since they're basic enough that they have no ssh command line access, there are limits on what you can do to debug them.
For my use case, though, powered by PoE and unmanaged is good enough.