First of all these arent professional helicopters these are only model rc helicopters. Secondly if I were you id buy a sim or a coaxial to start then after you master that you can move up to a collective pitch model to practice flying one and once you master that if you want somthing longer than 2 feet you could go for a 500 size electric for below 200 go on Ebay. If you just buy a huge powerful rc heli and try to fly it with no experience you will be out of this hobby way before you know it.