I have a Pismo on 10.3.5 and 2 brand new refurb iBooks 1 GHZ . Safe to do all the safe down load permissions dance and load with software updater. I have not seen many problems reported Also I am satellite hook up, Star Band and they frown a bit on large downloads. 3 downloads would be 75 megs. Should I download and burn the disk image or save and burn the package and then upgrade the 2 iBooks off the copies. A little scary as 1 bit of a byte might make the upgrade eat dirt Thanks Geoff