on buying a scale with bioimpedance

I'm thinking about buying a scale to weigh myself every day and play
with the some of the statistics I've been learning about in The Hacker's
Diet by John Walker.

Looking into scales on the web, I see there are scales that can measure
how much water you have in your body, how much fat and muscles and
possibly other stuff.  Sounds fancy and would likely give me even more
data to play with.  They're very cheap, which surprised me.  I was
wondering if anyone has any experience with this and would make a
recommendation.

I love stuff that's high quality.  I surely care about precision and
durability.  I wouldn't mind buying a more expensive one.  But, yeah, I
did like the idea of having a scale with bioimpedance.  Thanks for any
information.