First time on United, was quite impressed with the service - the boarding, as is common across the states, is so laborious - first class, then disabled, then parents with kids, then those special credit cards, those with some 'gold account' then eventually the regular economy folk. It's all a bit silly and takes ages. That being said, they tend to board nearly and hour before departure.
The flight itself was comfortable and efficient and the crew were polite and friendly. They also offer in flight complimentary soft drinks and a snack.
On time as well.