How could are the home oil change systems?

I am thinking to buy an automatic oil change system for my car which costs like $40 or so. What you think of this buy? Is it worth it? Did you experience any problem with it? please advise.|||maybe your could means good. hope so!|||i change my transmission fluid all the time right by my house. i just get a filter, gasket and about 6 quarts of fluid and change it. i never had any trouble with anything.