just my 2cents. I just bought a 120SR. Watch out for the tail motor. Mine burned out second evening of operation. Stock battery was also bad. HH is sending me a brand new one but I am grounded until it arrives. Indoors vs outdoors: If you can get it off the floor, you can hover indoors but it tends to pendulum around alot if you try moving it much. This is intrinsic to the 45 degree flybar design. Until the tail died, I had better luck flying outdoors over soft grass where there is enough room for the thing to swoosh around. If you do loose control, its better to dump into soft grass than your wall or in my case, refrigerator. Just don't fly in any wind until you get the hang of it.