I own the Lite-on 24 speed and I am very happy with it
So my advise is buy the Lite-on!!
But be carefull! I've been told there are two versions of this drive.
The 24102B and another one. (I don't know the number)
You must have the 24102b, because only this one can copy the SD2 protection.
I'am not sure of this is true b.t.w.