I've been annoying the dogs flying mine in the house. I've been wanting an indoor quad that was quiet enough to fly inside and not disturb the rest of the house as well as not blow anything not tied down into the furthest corners of the room, the mQX is perfect for what I want.
When I picked mine up at the LHS I flew the demo inside the store as well as outside, it does work outdoors but its so light the smallest amount of wind can carry it off in unintended directions so you really need to pay attention.
Best part of flying indoors is the 10 plus minute battery life, and I've flown it to 14 minutes before LVC forced a landing.
Ken