I've always used Autoglass for chips and not had any issues. None have spread.
I did give them a tough time with an old SAAB 900 which had brown tinted glass - the tints came in brown, green and blue. I was asked the colour of the tint (which boded well), "Green?", I was asked. "Brown", I replied. When it came to another phonecall when they ordered it, "Green?", I was asked. "Brown", I replied. When it came to fitting ... yes, it was green. The issue was remedied and the glass fitted the next day. Lovely to have a new screen.