Here anyone use iFLY F390 20A Mini 3-4s Quadcopter ESC Speed Controller BLHeli?
 

Introductions:
The iFLY F390 MCU Galaxy BLHeli Mini 20A 2-4S OPTO Brushless ESC Support Multishot for RC Multicopter is made specifically for racing drones. The Galaxy ESC keeps the weight down and comes in a small package but it still has top quality. It supports Damped Light for fast deceleration and brake. And it supports 4S battery, making it suitable for players with requirement of flying 3D. The ESC uses BLHeli open-source firmware. User can update the firmware or write setup via signal cable. Plus, "Damped light" mode can be changed via signal cable using BLHeli firmware to improve throttle response, reduce throttle amount while enhance the stability and flexibility of multirotors.

http://www.rcuniverse.com/forum/atta...mentid=2182552http://www.rcuniverse.com/forum/atta...mentid=2182553

Features:
1. Specially made for racing drones
2. Mini and light, yet still has top quality
3. F390 main control chip, imported top quality Mos and 3-in-1 driving IC, fast and responsive to throttle movements
4. Support Damped Light for fast deceleration and brake
5. Support Oneshot125 and max 500Hz with normal throttle signal
6. Compatible with all flight controllers available in the market
7. Support 4S battery, suitable for players that require to fly 3D
8. Use BLHeli open-source firmware, update the firmware or write setup via signal cable
9. Change "Damped light" mode via signal cable using BLHeli firmware to improve throttle response, reduce throttle amount while enhance the stability and flexibility of multirotors
10. Twisted-pair of the throttle signal cable effectively reduces crosstalk caused by signal transmission and makes flight more stable
http://www.rcuniverse.com/forum/atta...mentid=2182554
Specifications:
1. Brand: iFLY
2. Model: Galaxy
3. Current: 20A
4. Burst: 30A
5. BEC: OPTO
6. Voltage: 2-4S
7. Connector: 100mm
8. Suitable for: RC Multicopter
9. Dimensions: (1.14 x 0.47 x 0.24)" / (2.9 x 1.2 x 0.6)cm (L x W x H)
10. Weight: 0.23oz / 6.6g