I have a first gen harbor freight with added nylon mojo blocks and lever. On a budget it gets the job done I change a few sets a year, If you change a lot of tires get a better one I think they range from $600 - $1200 for a basic solid changer. Knowing what i know now I would have gotten a better one it pays for itself quickly.
Do some forum searches you find there's a few everyone recommends. Hears one I have heard good things about.