Well I have just signed up yesterday for my new website. Every question I have had has been fully addressed in a professional and expeditious manner. This is important to me. I would add though since I am very very new and this is my first website ever created. So I have had some newbie questions.
I would maybe consider appointing one go to person just through a 2 or 3 day transition period to work out any issues that arise as they did in my case. This would be good for continuity.
Although I never felt like I could not inquire if I had a problem.