I bought a UDM about two years ago, and it was a real mess for about 6 months. It was hanging every few weeks which required a hard reboot- which was shocking, because this was my first attempt at upgrading my network to more expensive and capable stuff, and for the previous 20 years, had
never had an issue with my network equipment hanging or rebooting. They were going to RMA my UDM, but then they had me install a special release as a last try, and it worked, and everything has worked well since then.
That said though, do I really need these features? The biggest draw was having a proper AP to put on my ceiling instead of my old google wifi pucks. The upgrade from wifi 5 to 6e was not noticeable in any way. I spent 3x the money and really have nothing tangible to show for it aside from a cool UI to log into, which was never necessary prior because everything Just Worked.
Also- this may be my fault for not reading the fine print, but the IDS stuff on the UDM only works at 600mbps, and I have a gigabit connection. People in Unifi forums will tell me I am the idiot for assuming that, but it has gigabit ports, its 2023... I just ass/u/me/d that everything would work without issue at line speed and wouldn't have to read the spec sheet like a lawyer.
Anyway, its fine in the end. I would never buy anything cutting edge from them again, I want anything to bake for at least 6 months after release, which is usually how long it takes for their "shipping" stuff to become actually available anyway. I will stop whining now :)