I have used the scales before and they seemed to reduce body fat % when I lost weight, so they must do something, but I am sure they are NOT accurate, but give an indication.
But trust me I know I need to lose some body fat, and I do not need scales to tell me this, only using the scales as a guide not a be all and end all.
Will post up my lifting results in my signaure once I have done this work out and set myself a bench mark, I have no idea how I willl go, so this will be interesting to see.