0c with a bit of wind chill will make it too cold to start without 'warming'
I had one on my 2017 GS. Really good and so, so much lighter. I kept it when I traded in my GS for a new GSA so will probably fit it in the GSA at some point.
Warming is done by turning on the lights and waiting about 30 seconds then try to turn over. It won't. Leave it another 30 seconds with lights on and it should work. once warmed up they are good to go. I suppose they could be 'lagged' to keep the chill off them. If you are a good weather rider then this will not be an issue.