Got a couple of UCG-Ultra units on order, but eta listed as end of May/June. It'll meet the needs of the two family members, beyond that don't really care re the 2.5GBit WAN port etc. Connection speeds they're going on are 350/35 and 900/900.
One to replace a pfsense instance and the other to go alongside a Unifi Express that'll be changed to AP mode.
I'm staying on pfsense/opnsense/Sophos XG atm and just landed another XG unit, XG135 Rev3 this time.
I would hope these MAX units don't have the screen issue that has plagued the UCG-Ultra from what I've seen. I expect they're being hit with unable to satisfy warranty replacements and re-stocking atm. Based on a few blogs I form the Unifi conference recently I believe the line up is expanding further. I do think there is product sprawl though, which has always been a problem. UXG-Lite I can already see as a product that won't sell well.