418 in NYC is a mess, just as it can be in many major metropolitan cities. Same for a lot of Canada for some reason.

URC originally added 433 for Europe since 418 was prohibited due to conflict with first responder's frequency. In some circles, the comment is that 418 gives you greater range than 433, but I don't know if that has ever been substantiated. Many installers use both frequencies in a 2 stack-o-gear house so they don't get any conflicts with the upstairs cable box being controlled by the downstairs remote.

MX880z was added as the only 2.4GHz (they won't call it Zigbee) in their mainstream line, and I don't know if they are going anywhere else with it at present. URC's 2.4GHz is used a lot in yachts & motor coaches since there will never be RF address conflicts. WiFi/ethernet at their high end has been good, especially with the affordable KP4000 and the recent price move on the MX5000.