I bought one of these as a gift for my sister at Christmas as she is useless with early mornings. It was OK for a cheap Christmas present, but not very good at flying. There are videos of this unit going around on the internet (which I had seen prior to buying) and it basically flies up and straight back down so it is easy to just pick it up and turn the alarm clock off by slotting the flying unit back into the base unit.
Also it makes a loud noise prior to taking off. The alarm and flight can still be turned off at that point by pushing down on it. A decent stocking filler, but not worth buying otherwise.