I am sorry... I cannot continue this review... There are no minus stars, which is what United deserves based on our recent traveling experience.
They bumped us off seats we had reserved six months in advance, and there was no communication to us at all. We noticed two days before our trip that for the second leg of our flight to London we had NO SEATS!!
"Yes", they said," we gave you a refund for your upgraded seats." but unless you are looking at your credit card statement daily how would you know. Plus if your family travel enough you would not know what the credit was for either.
At the end of the day there is an ethical aspect to this approach that United needs to re-examine.