Features:
Better coding practices and introducing tests, easier to maintain and for future development. (Dominic has software development background)
Many bugs fixed from Baseflight.
Supports more flight controllers, including CC3D, CJMCU and Sparky.
Supports OneShot ESC and more than 8 RC channels.
Additional PID controllers that uses floating point arithmetic operations. (now has 3 built-in PID Controllers)
Many more features such as RGB LED strip support, Autotune, In-flight PID tuning with your radio, blackbox flight data logging etc.
36x36mm board, 30.5 mm mounting holes.
STM32F3 CPU. High-capacity Flash (Acro 6DOF)
MPU6050 Accelerometers and Gyroscopes
MicroUSB socket.

4 x 4 pin JST-SH Socket (I2C, SWD, 2xuart)
2 x 8 pin JST-SH Socket (PPM, PWM, SERIAL RX, GPIO, ADC, 3V, 5V, GND)
8 x 3 pin though-holes for pin headers for ESC / Servo connections.
2 x 4 pin though-holes for the 2x serial ports.
2 x 2 pin though-holes for battery voltage and buzzer.

Flight Performance
The SPR  F3 builds on tried and tested software, processor and sensor technology to make your aircraft fly like its on rails.

 
No-Compromise I/
Use all the features all the time.. Connect your OSD + SmartPort + + GPS + LED Strip + Battery Monitoring + Sonar + 8 motors - all at the same time!
 
Configurable
The SP F3 runs Cleanflight which can be configured to suit your needs using a cross-platform GUI (/OSX/Linux).
 
Tiny and lightweight
The RacingF3 has a standard 36x36mm form-factor with 30.5mm mounting holes and weighs just 6 grams.
 
Flight Logging
On-board high-capacity black box flight log recorder - optimize your tuning and see the results of your setup without guesswork.
 
Next-Generation CPU
The RacingF3 has an ARM Cortex-M4 72Mhz CPU with Math co-processor (FPU) for efficient flight calculations that gets more done in less time.
Loop times up to ~2x as fast as previous-generation STM32F1 based boards.
 
Developer Friendly
Developer friendly debugging port (SWD) and boot mode selection, unbrickable bootloader.
 
OneShot ESC
Full support for OneShot ESCs for easy PID tuning and a sharper response.
 
Broad RC receiver Support
Supports , SumH, SumD, Spektrum1024/2048, XBus, PPM, PWM receivers. No external inverters required (built-in).
 
Programmable LED
Dedicated output for programmable LEDs - great for orientation, racing and night flying.
 
Battery Monitoring
Battery monitoring ports for voltage and current.
 
Sonar
Sonar support for precision low-altitude hold.
 
I2C Port
I2C port powered, perfect for external sensors or -on OLED Screen.
 
Buzzer
Buzzer port for audible warnings and notification
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