I updated my Ubiquiti home gateway from the USG and CloudKey2 to the UDM; it was pretty easy (backup configs for cloudkey and protect, and load them into those sections of the UDM, connect and it eventually rebound all devices). The higher powered UDM solves two problems.
First , it lets me get full speed on my pathetic 75up/7down network while having “smart queues” (QoS) enabled (the USG would only do about 40/5).
Second, I can turn all the goodies back on that would have further slowed the USG; intrusion detection, network scanning, and deep packet inspection.