Yeah reg drives are around 12-15w's.
Judging by the 5v and 12v rails amps they tend to be rated for.

While these green drives are rated far below that.

You can have 2x greens and still run lower power then a single drive.
When you raid them, it's gonna be faster then a single black anyways.
Definitely worth something right there.

That's why I picked them.
I'm all into saving electricity.

Instead of using the same amount of power as 2 cfl's (2x blacks), I'm using less power then a single cfl light bulb with 2 drives...

Besides the fact that I was originally on a 350w psu, I figured the extra watts left over would be a helpful.

I almost bought 2x laptop drives instead, those don't even use the 12v rail .
But getting large ones like the 1tb's I got cost to much.

After modding they perform decently.
As a single drive, they are ruffly 10megs slower then a single black (explorer file copying in win7).
I've got a 500gig black for my mom to the side and that's what I'm comparing to.
I didn't want to take a chance on a new green drive not being modable so I bought her a black drive.

Green drives or older seagates would be the only ones I would put in an xbox or whatever.
I've got an older 40gig seagate in my original xbox right now.

I would not say greens suck...
I like them, and I would definitely buy more if I was sure about the tler and idle thing.