There are broadly 3 types of Company Formation entities:
The cheap and cheerful newer companies that have popped up recently, there are tons of Legalzoom competitors since I looked in 2011. One such company that I looked at in 2011 http://www.smallbiz.com/ charged only $25. Their website appears to be down. What happened to your sensitive documents and reminders if dealing with a company such as this? <(Edit their site appears to be back up but it’s deathly slow. I would suggest a more robust company for such sensitive and important information).
Then there’s big corporations like LegalZoom and Incorporate.com.
Lastly there are the smaller specialist companies like MyNewCompany.com
This is the sweet spot as far as I am concerned, you are dealing with a company that specializes and has a solid track record of reliably helping their customers and in the case of MyNewCompany.com going a step ahead when it comes to looking after their customers. I know this from experience.