Standardized State Contract, Shortened Contract, or Your Own? What do you use in your state?

[Account Closed]

What type of contract do you use to make an offer for potential deals that will NOT involve a Realtor? 

-A standardized state contracts (from the state RE association)?

ex. for Tennessee: http://tarnet.com/pdf/2014BrokerForum_AllForms.pdf

-A shortened contract like this?

ex. TN: http://www.realtyassociation.com/files/purchaseagr...

or

-Your own version?

Are using contracts other that the standardized state RE association legal in your area?

I'm particularly interested in those of you that have experience in Tennessee. Thanks for any input!