I'm actually doing the the DCA to MCO (and soon to be IAD to MCO) segment every week. I did about 6 weeks with US and I can't stand them anymore. Their customer service is absolutely appalling and they will absolutely not do any type of match of statuses. They screwed me over on the Silver Trial because of Jump Start and they want $200 for a Silver Challenge. No thanks. United matched based on a simple email and their customer service has been slightly better.

Also, I would say 30% of my US flights have been delayed too...going to start flying UA in August to see if its any better.