The AC performance isn't significantly better than N on this unit. I've seen some mixed reviews but the firsthand performance (even when sitting 10ft away) has been pretty slow. Hopefully some new firmware updates give it the dose of amphetamines that it needs.
I am currently in the process of replacing 16 of these because ZyXEL doesn't keep current with patching their software. I had to disable external https access because ZyXEL still hasn't patched known vulnerabilities. From a reliability and throughput standpoint, these are great but ZyXEL needs...
I have two UAP-AC-PROs and run the controller software (v4) on a VM on my NAS. They have been working for about 6 months without any sort of issue. I've upgraded the controller software to push newer firmware a few times. From a reliability/stability standpoint they work awesome. I haven't moved...