My buddy has the Air Hog Reflex. His friend bought one of the cheaper ones, and it didn't work very well.
http://www.yourstoreonline.net/(S(magfki...6&subId=109
He really likes it and flies it around the living room all the time. Only problem is finding replacement blades after you break the extras they give you. He couldn't find any, and eventually bought a 2nd helicopter so he could keep flying.