I have a doctor-style scale, the big floor model, with the sliding weights up top. I got it in late 2004 and don't plan on replacing it anytime soon. I know it's accurate. I tested it against the scale at my doctor's office last week and they were within half a pound of one another.
Now, just because I'm satisfied with its accuracy, that doesn't mean I always like what it has to say!

Matter of fact, I went almost a year without stepping on it because we just weren't on speaking terms.
It tells me things I don't want to know, but at least, it's honest. Brutally honest...