Free WordPress hosting

I plan to move my blog to BlueHost as soon as my hosting account expires next year. But as for the rest of my blogs, I’m currently quite content hosting it at 000webhost.com for free, since I’m currently on a tight budget after the birth of my son, and those blogs of mine aren’t receiving any serious traffic anyways. Blog of Rugrats is currently hosted there and so far the access to the site has been as good as the paid hosting I’m on now.

I know I’m taking a pretty risky choice of hosting my blogs on a free hosting. Would you be willing to do the same thing? Under what circumstance would you choose a free hosting over a paid one?