I would say halfway there. Don't rely on me for this, you should do your own research if you buy the drive. The following is just my personal experience with greens.
Most of the intellipower drives will park their heads after 5 minutes of idle. This could be to your advantage depending on appliance but for most people who don't want the head parking to shorten the drive life, there is a tool made by WD called wdidle3. This will actually modify a setting within the nvram of the drive so that it is permanent. You can set a much longer idle timer or even turn off head parking.
I have a 1.5TB version of the green drive that I modified with the tool. You can verify if it worked by checking LLC with a SMART tool. No complaints from me. The greens are dead silent which is one reason I bought it to begin with.