Has anyone had any experience with solar ovens or solar bbqs? Positive or Negative results?

Question:

I'm looking to build or demo a solar oven for an upcoming event (in August in California, so I'm sure lack of sun won't be an issue). Anyone know how long it takes to cook say, burgers and veggie burgers? Can you lease them or demo them from anywhere? I'm totally new to the solar cooking experience.

Answer:
Definitely build your own. There are many websites with great ideas. Here's the simplest one yet. I built this in 20 minutes and had baked potatoes done to perfection.

http://solarcooking.org/plans/spc.htm...

Recipes: http://www.sunoven.com/recipes.asp...

More recipes: http://www.solarovens.org/recipes/fish-f...

And more ideas: http://hannahgrimes.com/localvore/solar_...
http://solarcooking.org/plans/minimum.ht...

Just search solar cooker oven.