I was offered a RE3/RE4 in replacement of my WD10EADS (1TB-Green) when it conked off recently. .I had to decide on the spot when the support person called me up and since I had no idea about RE3/RE4 ,I settled for a WD 1001FALS-(Black).Looking at the clicking noise issues I dont want to get back to a 1TB Green drive again :|.