Got mine today and within 30 mins of unpacking it i was flying it into walls (lots).
I just finished my first play time with it, and it says it has a flight time of 5 minutes or so, take into account you will spend a fair bit of time running to pick it up again so i easily got 20 minutes out of the 20 min charge.
Its really light so its best used in a room with no currents of air (not tried it outside yet) but even in a non breeze room my copter wanted to keep turning (maybe small design issue) but this was not really a big deal as i soon learnt to adjust the turning so it compensated and if i wanted to go the other way i just let off the turning stick.
Another reviewer has said you dont have much control, well this is partially true, but i would say with more practice you can gain more control, for example i managed to get it to hover round my 9x8 ft room for a good minute with some degree of control (this was on my first go too!)
Once you get the hang of not letting go of the "lift" control when it goes too high you will soon do well (i KEPT doing it)
Overall for £15 i was well impressed, i just wish we had toys like this when i was younger, brilliant toy for any child (or child at heart) just make sure people dont mind the noise!