Hello all, I just Upgraded my system, new iMac 17" 3 weeks old (1.25 ghz), and the first thing I noticed, the boot time has been reduced to 1/3 of the time. The second thing, The fonts which where my main complain, have been improved so much. Now they look sharper and there is less grey in them. Third, Some websites that I had problems with before, now are better. I can see the content, it respects the distribution of the information. It is just way better. Fourth, Preview is a Huge improvement. I guess it does it in combination with the new Quartz . Great. I have not tried too much stuff yet, but the things I just described bothered mee so much that I am a really happy camper now. Note: The upgrade process only used disk 1 and 2. At the end of optimizing disk 2, the upgrade process automatically ejected the CD and called the Quit Installer, therefore the last step shown in the list af the left of the installation window was never executed. I guess that is the way it should work. PD/ I forgot, Mail is a lot better also, as well as Finder.