This is a good purchase only if you need a high capacity drive, wether it's RAID 0 'striped' to get it's maximum 6TB capacity or using the peace of mind RAID 1 'mirror' for security albeit at half the capacity but then again 3TB is a lot for RAID 1 mirror.
Unfortunately, speed performance in terms of transfer rates are poor. This capacious capacity drive is NOT going to give you decent transfer rates so be aware of this before you buy. To my surprise even when trying out RAID 1 stripped using the Firewire 800 connection, the speed of transfer rates were appalling in my opinion (worse than expected).
I did have a good idea of this before I purchased having read some reviews on the internet, so admittedly I knew what I would be getting in terms of speed performance however my main requirement was to get an external hard drive that had 1. largest possible capacity for RAID 1 mirror use with, 2. lowest price with, 3. smallest desktop footprint and finally with, 4. reliability (having had two single drives fail on me in the past)... Here the WD MyBook Studio II 6TB ticks all the right boxes, it's just a shame that the transfer rates aren't the best especially if using in RAID 0 striped with Firewire 800, because in theory the stripped mode with Firewire 800 interface should in reality give decent transfer rates.
Oh, it would have been nice if the casing had been a metal construction and not plastic, shame.
In short then:
The Good:-
Massive storage capacity
Relatively small for its configuration and capacity size
Easy to use
Good price if you look around properly
Looks the good, very Mac-like
Last of the WD drives with the nice LED Status light (WD have took this away from their other models - stupid)
Quiet and relatively cool in use
The Bad:-
Poor speed performance
Plastic construction not metal, which is a shame. I previously had a MyBook Studio 1 and a couple of scratches revealed a horrible normal white/grey plastic beneath taking away the metal look
Restricted to ONLY using Western Digital Caviar Green drives - NOT a universal 3.5" drive RAID unit
You really have to push down hard in the right place on the top lid to open it in order to access the drives - so much so that one feels as though they're about to break it, BE CAREFUL!