Self Publishing Company … Who should I choose?

I think self-publishing a book or two and maybe a calendar or two. Top Now I know Two online companies that are established for the task. Book Surge Publishing and Lulu. Has anyone used any of these companies? What do you think of them or another company has to offer?

I use Lulu. It is very good, and offer other services such as editing and marketing. The process is very easy to use, but as a POD (Print on Demand) If you want to sell something on something like Amazon is saying it is in stock and six weeks for people to obtain, when in reality it may be printed and sent to someone as a week. But this is obviously difficult, people tend to panic if they are not going to get what they ordered for six weeks.