I saw this story and wanted to know if anyone has used the service and if they liked it?

United has brought in nearly $43,000 since March 1, thanks to a new feature on its EasyCheck-in kiosks that allows premium cabin upgrades. Once offered an upgrade, customers can swipe their credit card at the kiosk and process their transaction. Soon, customers also will be able to upgrade to Economy Plus seating through EasyCheck-in kiosks.