Have you used an ecolog?

Green fire logs

I recently completed a small retaining wall, and I had some leftover stones, so I built a fire-ring. Consequently, I'm thinking about trying out Ecologs, if the weather ever cools here in SoCal. I saw a show on Discovery - I think - about these green fire logs, and I wondered how well they worked.

Has anybody tried out Ecologs, or a similar brand?