They actually aren't all that bad.

Kinda tastes like a really dry sugar cookie. As such, you need a really tall glass of milk to properly wash one down.

The seem to expand in your stomach when you eat one and have some water, so they are filling to some extent, believe it or not.

I had some in my emergency supplies, and broke open a package and ate nothing but for a week. I was left a little hungry and I did drop 3 pounds, but I was no worse for the wear.