These kind are hit or miss. Have 2 that work perfectly and fly very well. Friend got one with a dead motor....next one he stripped some gears (his fault this time). No replacement parts....
But they work fine when working. You can even find them locally and rebranded. Seen them as cheap as $20 (when I bought them locally) and as expensive as $70 (HAHAHA).
http://www.xheli.com/56h-s107-miniheli-yellow.html
edit: actually see xheli has spare parts...will have to let my friend know so he can get it going again.