I have had this rig for a few weeks and is perfect for run and gun shoots, the Cambo GH4 Rig v2 comes with the longer camera plate and 4 screws.
This allows you to attach the Manfrotto quick release camera adapter (not included) to the rig via the 4 screws provided making a solid connection for video work. You can unscrew the weight at the back of the rig if you feel its back heavy.
Although its called the GH4 Rig you can also use it with various other cameras in this case the Sony A7s though I do recommend using a loupe to keep daylight off the LCD.
Smaller video cameras like the new Sony PXW-X70 can also benefit from the Cambo GH4 Rig v2 especially using the quick release Manfrotto plate. Cambo rigs are not only solid but very practical and easy to setup, everything locks into place and made with the greatest of care. The rigs are made in the Netherlands and can be bought from various resellers like Production Gear.