Like many others that I have found on this site and also on the United Airlines Flyertalk forum, many people have been frauded by the explorer card's offer of a $250 statement credit after their first airline ticket purchase on UA. They are not honoring this offer and I've been told the same line of bunk as the others. I guess the next thing is to file a consumer complaint with the FTC and let them get involved. Be very very wary of any Chase United A. cards. It's not the airline, it's Chase. Just don't believe anything they say.
Bottom Line: No, I would not recommend this to a friend