Bad vendor contracts

According to attorney Mark Grossman, most IT contracts are “atrocious, poorly written and short on details.” In an article in ComputerWorld by Thomas Hoffman

http://www.computerworld.com/careertopics/careers/consulting/story/0,10801,95396,00.html

the legal advisor says that writing ineffective contracts is a common practice of technology buyers because they fail to ensure system performance promises from vendors. Do you specify in your contracts any kind of performance assurance clauses?