This helicopter is a really good size. Although the instructions say that it's meant for indoor use, wow - you'd need a BIG room to be able to sensibly fly it around! So, our helicopter got taken outdoors I'm afraid where, once the controls were tuned, it turned out to be very stable and a lot of fun for both large and small people to fly. As other reviewers have stated, it rotates and goes up and down very well but flying forwards is very slow. This is an issue if there is any breeze present as it'll undoubtedly end up somewhere that you don't want. At present ours is stuck very high up in a tree having been blown there and then getting it's rotors tangled and I can see that this weekend I'll be risking life and limb to rescue it as the kids are really upset. On the positive side, the helicopter does to be quite robust as it's survived numerous crashes so far and - a nice touch this - the set does come with some spare parts although we've not yet needed to use them. I'm not sure how much of a useful feature the glow in the dark aspect of this helicopter is. We've not yet felt compelled to go out in the dark to fly it, so I can't really comment on how well that feature works.
So, in summary I would recommend this helicopter as a really fun, and robust, way to spend time. However, do only use it when there is no wind or else you, too, may find yourself scaling trees in your spare time!