I got one of the 1TB MyBook Studio last week and as good as it looks it has its problems
My iMac will only recognise it via USB, it will NOT see it via firewire 800 at all even after various firmware updates downloaded from the WD site!
I am led to beleive it is an OSX 10.5 issue and not the Mybook's so hopefully with future updates firewire is possible because at the end of the day tha is why I bought it!
I had a black standard 500gb Mybook before this and it failed after just 3 months so I dont really have much faith in them so I have another iOmega drive doing the same job, just incase
