When I pressed him for details, he would only say that it is not possible to downgrade from Snow Leopard to Leopard if you are unhappy with the upgrade.
Well I am no Mac Genius but I wonder if you have your HD backed up with Time Machine if you could not do a format of your HD, install Leopard and then copy your data from Time Machine at a pre Snow leopard time.
There must be some catch as this seems too simple to me.
Any Mac "geneii" care to comment?