What does everyone think of scales that measure your body fat, water, muscle mas!

What does everyone think of scales that measure your body fat, water, muscle mass etc. How accurate are they?

Would you recommend buying one?

I'm probably oversimplifying but these scales work by sending very weak electrical impulses through your body and measuring resistance. Results are affected by whether or not you've just exercised or eaten or had something to drink, and of course whether you've voided your bladder or bowel or not (which explains why the previous respondent found discrepances before and after urinating), also I suspect if you have bloating before a period. I have an Omron hand-held body fat gauge as well as the multi scales you describe. At my gym they have an Omron hand-held. I haven't seen great discrepancies between the three. I think you can have reliable results if you consistently use the same device at the same time of day, preferably first thing in the morning just after weeing but before having anything to eat or drink. However, I see no point in taking measurements several times a day, not even once a week. To measure progress on an exercise or weight loss programme once a month should be enough.