Consideration at the time of the execution of the non-compete is no longer required.  The agreement just floats in cyberspace until consideration is later found.

Customer lists were never considered proprietary in Texas.  Now they are included under the rubric of "goodwill."

Americo Life, Inc. v. Cook, No.10-0734, 55 Tex.S.Ct.J. 184 (Tex. 2011).