[SOLVED]Setting IP static

First of all many thanks to Sam and the team for all their work and effort. Looking forward to the RC when it comes.

I also wanted to have a wired static ip address. After searching for a while I found a post in a different forum that suggested this command:-
$connmanctl> config service --ipv4 manual ip address netmask gateway
On my Pi2 it looked like this:-
$connmanctl> config ethernet_b827eb055694_cable --ipv4 manual
To find the name of the service:-

Is there a disadvantage in using this method?