I could not be without my scales! I know people say not to weigh but I do every day and it keeps me on the straight and narrow. It's like as soon as I step on them in the morning i'm making a promise "I will stick to the plan today!". When I don't bother I become really complacent with what I eat and it's then that weight starts to creep on.
That being said, I have a TERRIBLE memory and can never remember what the scale said the day before so I can't obsess about little fluctuations!