I just landed few hours back. The flight was not bad but I would still prefer British Airways. The good thing of traveling on United is that its non stop to DC 13 hours and 15 minutes. Their economy chairs are really small. I couldnt even stretch my legs properly and the flight was packed.
The security situation inflight and at airport is not at all like I had read on different blogs. They are pretty easy going. I guess it all depends on how you talk to them. I honestly have never faced any problems when traveling to US but have heard alot of people facing issues.
The best part is the weather. Its cold its really cold and I am loving it!!!