Here is a new compact FC but equiped of the F3 processor, more powerfull allowing to decrease even lower the looptime for faster quad’s reactions: http://www.banggood.com/Kingkong-Micro-F3-6DOF-Mini-Flight-Controller-p-1046771.html
Description: User Manual 1, 2
Brand Name: Kingkong
Item Name: Micro F3 6DOF FC
Compatible with Cleanflight SPRacing F3 FC.
Small and light
Size: 37.5 x 20 x 12mm(without pins)
1 x F3 Flight Controller
1 x Shock Absorbing Set
Ideal and relatively cheap FC for compact 4S racer (<= 180mm) IMHO.... Of course to associated with last Betaflight version.