composter base concrete or dirt?

I bought this soil saver composter.. it's basically 4 sides with a lid, you can see the ground. The instructions says place it on "earth". But can I place on the concrete? Does it make much difference?
Choosing between a soil area vs concrete, the concrete is out of the way, and it gets way more sun. The soil area is about 5 ft from my bedroom window.
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Jeremy, it depends on where you live.
In the arid country I find myself in - I dig about 8 to 10 inches down in ground and keep the compost pile in the shade.
I'd only be making compost in the sun on concrete in a place like Seattle.
Steve
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Having the compost on the dirt ground allows worms and microbs to enter the compost pile. If it is placed on concrete or inside a container, add some soil.
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