Don't buy a more expensive pressure cooker.  The quality of this cooker is as good or better then any on the market. Furthermore, since it is so popular, if you loose a part and/or a part breaks or deteriorates with age, you can replace it.  I have used different pressure pots - this is as good as it gets.  It has a common sense design and is easy to use.  Six Quart is the most universal size.  People who are canning may want a larger capacity version.