We bought these scales to replace our old ones which, as well as getting a little scruffy, we suspected of inaccuracy. Turns out they were giving the right weight - at any rate, the new ones read exactly the same as the old ones, which gives us confidence in them both.
So what's the difference? These scales are much better-looking, with a transparent glass and grey plastic look. Although they are very light and may appear flimsy at first sight, be assured they are quite robust and won't shatter if you kick them by mistake. The dark readout is quite large, but I should say that it doesn't show up as well as the illuminated LED display on our old scales. I find that I often need the electric light on to read them easily, but that is not a problem.
The best thing about these scales, we find, is that they report your weight to an accuracy of 1/4 lb or 1/10 kg. A reasonable rate of weight loss is about 2 lb or 1 kg a week, so with these Weight Watchers scales you can expect to see some progress every day. Of course it doesn't work like that, and you may be 2 lb up one day for no particular reason at all, then down 3 lb the next day. Still, I like the more precise readings. BMI, if you take it seriously, is trivial to calculate with a spreadsheet or a calculator; and things like body fat measurements are notoriously unreliable. So all you need is your weight, and that's what you get from this device.
What else? I suspect they use far less electric power than older scales. Instead of one of those chunky (and expensive) 9-volt batteries, they run off a large watch-type battery which no doubt will last for years.
All in all, a good robust, pleasant looking device that does what it says on the tin reliably, and gives you that extra level of precision. Very good value for money.