I have many flights on my Swift 16 using various different pinions on the Century 600+ motor, their 55A ESC and various 4S, 5S and 6S packs. I found the Century Swift with their relatively inexpensive power system to be a great combination. It has well over 300 flights now. Its last 200 or so has been with a hot 6S set up for a high head speed for some pretty extreme 3D. It is a very versatile heli and power package that is easily set-up for any type of flying, for low rotor speed training and scale flying to high head speed 3D pop...or anthing in between.

I am not familiar with the 2100 gyro but I have heard good things about it. I have used a number of gyros on mine. Currently it is using the Futaba 401 with its designated servo. All worked well enough for training and as well as for forward flihght and even softer 3D, but not as well for the hotter 3D as the 401 does.