I purchased on of these in 2011 to replace a collection of smaller drives. The drive is great, and has never given a single problem.
Same as every other WD drive I have had, and why I always buy WD drives.
As for the drive, I like the fact that it powers down and only spins up when you try to access something on it. This may be a problem for some users, but I think the power/heat saving is worth the 2 seconds, and the speed is great once it's up.
My machine is silent, using a case built for being unheard, a zero db video card, slow speed ultra quiet fans. So if this was noisy I would hear it, and I don't. I hear it spin up when accessed (not loud, audible), but then is settles to very quiet.
And the transfer speeds are excellent, even with my quite old PC. Considering I have a SSD and much older Blue drive, there is no noticeable speed drop for this being a 'green' drive.
There has been comments in other reviews about WD OEM drives having 1 year warranty and being 'out of region'.
The out of region was easily FIXED by updating the country on my WD account, so that is not an issue with the drives.
As for the OEM/1yr, according to the WD support site, drives with model number ending EZRX have a 2 year (component) or 3 year (Retail) warranty (check under support - Warranty Policy).
My WD30EZRX purchased as OEM from Amazon in 2011 had the 3 years, so I don't think this is an issue. But either way, you can check the warranty before you remove the drive from the sealed static bag.