Wow, this is an amazing toy, I can't believe that the little guy can fly and is so stable! Mine worked perfectly out of the box, was stable, flies great indoors. Takes a bit of time playing with it to get used to the controls, and starts out just hovering. To get some forward motion you need to bend the tail boom clockwise a bit when looking from the back toward the front of the helicopter or add a bit of weight to the front of the 'copter, both actions result in the 'copter tilting a bit forward and thus creating a bit of forward motion.
Note that this is a 2-channel copter, you control up/down and clockwise/counterclockwise rotation. With the technique described above you get a constant forward motion, and the clockwise/counterclockwise rotation can then turn you right and left.
This entertains adults for days (10 minutes at a time, 20 minute recharge, repeat) and is great fun for pestering cats and other indoor pets. A no-regret buy for yourself or anyone else who likes toys (kid or adult)