Slow SD cards for K20D or perhaps...

Just our of curiosity, why would anyone get anything other than a SanDisk Extreme cards, they aren't that more expensive then the Ultras (other as well) they are super fast and reliable.

http://cideway.com.au/2011/12/taking-it-to-the-extreme/

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Chris.
A weather sealed ultra wide, is that too much to ask?
http://www.pentaxphotogallery.com/chriside
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Pentax SLR talk FAQ
http://forums.dpreview.com/forums/read.asp?forum=1036&message=23161072