A shed for grain

I'm writing an article for the June issue of Grainews on storing grain in a multi-purpose building. The translucent tarp-topped sheds are one option. With a concrete bottom and sides, they provide a clean dry place for surge capacity. Then when you empty the grain, you can store machinery or bales or dry fertilizer inside. I got this photo from Cover-All, one manufacturer of these buildings.

Many European farmers use flat-bottomed sheds for all their on-farm grain storage. They scoop out the grain with loaders. I'm sure an auger and bin sweep is more efficient, especially for a very large building like the one in this photo. But I'd like to hear from farmers who use multi-purpose buildings to store grain. What are the benefits? What are the down sides? Email me your thoughts or post a comment.