I bought an OMRON Fat Loss Monitor 6 months into my weight loss blogging (November of 2007). I haven't used it much, but I did record two times I used it. There seems to be some inaccuracy (maybe just I used it wrong), but I'll post what it gave me:
276.4 lbs: BMI 44.5
Nov 16, 2009--
267.2 lbs: BMI 44.5
Oct 20, 2010--
252.2 lbs: BMI 40.8
Last time I checked, it gave me a fat % of 48.3.
Today, it showed a fat % of 46.0.
Well, progress. :)
I guess I can put the gizmo away until next year. Heh.