Text-Expanders to increase your efficiency?

I was introduced to the idea of a "text expander" at work.   I am not sure I would be able to use it for "everyday" type of activities, but if you have any phrases or pieces of information that you repetitively type, then you may find it useful.

Here are some options that I ran into while using Google.  Disclaimer: I have not personally evaluate or installed any of the programs.

Windows:

• Shortcut (http://www.sylvansoft.com/shortcut.htm)
• Shorthand (http://www65.pair.com/lim/shorthand/)
• ShortKeys ( http://www.shortkeys.com/)

Mac OS

• TextExpander for Mac (http://smilesoftware.com/TextExpander/)
• Spell Catcher (http://www.rainmakerinc.com/products/spellcatcherx/)
• TypeIt4Me (http://www.ettoresoftware.com/products/typeit4me/)
• Typinator (http://www.ergonis.com/products/typinator/)

If anyone has experience with these, please let me know.