I’ve been using these scales now since September last year. They are excellent value at £17.99 comparable to £50 ones elsewhere.
http://www.lidl.co.uk/uk/home.nsf/pages/c.o.20070714.p.Digital_Body_Fat_Monitor.ar7
This year Liddl have dropped the price to £9.99 which is superb value.
I’ve been doing a morning weigh-in everyday so if there were any problems with them they would have shown up by now. They are accurate and repeatable.
Some may dispute the body fat measurements but the important thing with all of them is the trend. Mine is still around 27% the lowest it has been is 26.5 %. Your not going to see wild swings in body fat measurement or muscle mass for that matter but this shouldn’t put you off.
Highly reccomended.