It's been awhile, but when I flew them in Business, they were great. You even got a present at the end of the flight! As christep says, they've won numerouse awards and even airline of the year. Only downside is that they do have 10 abreast seating on their 777 aircraft (most airlines are 9 abreat).

You can earn miles with United (it used to be only on code share flights), but the miles don't count towards status.

So if you have an opportunity to fly with them, go for it.