Really;
Yes, it did great taking off one 12k+ foot runway and landing on another, both at sea level. It is good at that So have some of them to cover the easy stuff. The US (and Europe) have a significant number of inner city airports with short runways. LGA, DCA, SNA are all big markets for UCH. 900's aren't going anywhere near them. They are also not doing well to the islands, especially Maui.

You can fill up a newer 321, take off from LGA and fly to Denver. You would be lucky to be able to ferry a 900 ER on the same route.