In the past I have done fresh installs of OS X when moving from say 10.3 to 10.4. I know a few say just upgrade but I always feel there are remnants of the old OS if you do that so I do a wipe and download a complete OS. Any thoughts from those devs working with the Mavericks at the moment? Also I plan (when it is released) to do the following: Boot from external OS --> wipe the fusion (recovery drive and all) in my 2012 Mac mini through disk utility --> Boot to Internet Recovery in the mini and install Mavericks from there. I then re-build the OS apps from scratch as I like to do that every year or so anyway (for fun - throw out the old, in with the new). Will this work (through internet recovery) or will I be forced to DL the original OS first (ML) before downloading Mavericks? Any comments appreciated.