A proper Quad - will be a missile compared to they toy quad you have tried.
What I have found is that the Naza regulates the power - it manages the power band so that the Quad hovers at exactly 50% throttle. It also limits the power - so the exact same Quad with a Naza will be much slower than the same Quad with a KK2.
You can fly the Naza in Manual mode - but it's not advisable until you can fly in that mode!
The Naza has 3 flight modes - atti (where it auto levels / holds altitude) gps atti - (same as atti but it also does gps position hold) - and thirdly - full manual.
The KK2 only does 2 modes - auto level (not altitude though) and full manual.
Basically - with a properly set up KK2 - you are flying the model - and it's awesome, but you will crash. With the Naza - it's flying the model and you are telling it which direction to go in - you have to be doing something silly - or have something fail to crash it. In Gps/Atti mode - if you let go of the sticks (throttle at 50%) it will stop itself and hold position. It can also 'return to home' using gps and land itself. With the KK2 - you let go of anything when it's flying and you crash.
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