Yes, they are very quick and very unstable. You have to stay on top of inputs, and anticipate to a fair degree what the heli will do next. That will come with practice and flight time. In the meantime, you really should get yourself a sim, and follow Radd's School of Rotary Flight, read and reread the manual, and check with the folks in the helimax forum under electric rc helis on the main page. I am sure they will be able to straighten you out.