We paid for extra leg room on the flight to Shannon. It was nice, but the seats didn't recline because it was a exit row, so not sure it was worth it in the long run. Staff was pleasant and seemed to enjoy working together - better than crews on Delta, who have been a bit surly on recent flights. We left late at night and had dinner before the flight, so cannot comment on food. Flight arrived early in Shannon which was nice. Bags arrived too!
Flight home was delayed a couple hours due to fog, but we were kept updated by texts and announcements, which were informative. Friendly crew at Shannon too. They were able to get us two seats together, which was nice. Only suggestion I have is that the dessert served with lunch should be on the same tray as the lunch. It was ice cream on our flight, and was served after the lunch trays had been picked up - this meant that the flight crews were in the aisle twice as long, meaning everyone had to wait to get in line to use the bathroom. Movies were good. Would probably choose United over Delta - have had too many bad luggage experiences with Delta lately.