GH4 Silent

Hi,
I have the Panasonic GH4 which I mostly use for it's filming capabilities. However, I'd like to take more stills with it and was curious about its silent mode. There are many advantages to this, but I was wondering, are there any disadvantages to it not using the mechanical shutter?
yours
Jonathan
Ps hope its okay I'm posting here. i thought street photographers would know most about 'silent mode'.