
I recently purchased one of these drives to use as a local backup (after losing a single drive to mechanical problem and so far I have been happy with the little unit.
It's not the most interesting thing in the world but it does it's job well. It's quite, small and was quick and easy to set up. The range of connections is very good and I have been happily digitizing to it from Avid Media Composer using the esata connection.
The RAID gives you that peace of mind that is something does wrong at least you have fighting chance.
The only downsides are the power save function (which can be good and bad thing) that when the drive is not being accessed it goes to sleep and can take a few seconds to come back to life and the lack of esata cable in the box was disappointing but I don't think that is limited to Western Digital.