Vivint told me they would charge me 53.** per month for my package. I paid a start up fee of $206.99 in May and was charged $793.78 in June for I don't know what. Something about a control panel that I don't have. Worst customer service I have ever dealt with in years.
There are lot's of options for home security so make sure you shop around and do not fall victim to their aggressive sales tactics.