Cheapest I have seen for the latest Mac OS. I think they have ironed out most of the earlier issues so I think its a very good price for the upgrade!!
Mac OS X Snow Leopard is built on a rock-solid, time-tested UNIX foundation that provides unparalleled stability as well as industry-leading support for Internet standards
Improvements include a more responsive Finder, new look and features for Expos?nd Stacks, quicker Time Machine backup, faster common tasks and installation, a smaller install footprint and more
New core technologies unleash the power of today's advanced hardware technology and prepare Mac OS X for future innovation: 64-bit computing, multicore-optimisation, OpenCL, QuickTime X and more
With virtually no effort on your part, Mac OS X protects itself--and you--from viruses, malicious applications and other threats
Mac OS X Snow Leopard includes built-in support for the latest version of Microsoft Exchange Server, so you can use Mail, iCal and Address Book at home and at work
Mac OS X is the world's most advanced operating system. Built on a rock-solid UNIX foundation and designed to be simple and intuitive, it's what makes the Mac innovative, highly secure, compatible, and easy to use. Quite simply there is nothing else like it.