Although I may not be an Apple user (yet), I believe I certainly have my say in the recent release of Apple Mac OS X Snow Leopard.
According to the users of OS X Snow Leopard I have had the privilege to speak with, as well as those whom have made their opinion public (such as Chris Pirillo), Snow Leopard is by far worth the $30.* The only issue I have heard about so far is a poor range of software that is actually compatible with Snow Leopard. Some positive things that I’ve heard are that the upgrade can free up to gigs upon gigs of space on your hard drive, and that the operating system itself is much faster. Again, don’t take my word for it because I am not an Apple user (yet).
If you are an Apple user interested in upgrading your current install of Apple OS X Leopard the $30 upgrade can be purchased at the very low price (the lowest you’ll be able to find) of $25 USD from http://go.tagjag.com/snowleopard.