Folks, I purchased the new Shredder 12 (Linux version) and I am extremely happy!  Here is my review! 

http://www.associatedcontent.com/article/2330314/shredder_12_for_linuxbased_systems.html?cat=15

Glad you like it. I hope they get their Mac version on track soon, as I liked their Windows trial but was totally underwhelmed by their Mac version. :\

I haven't seen the Mac version.  I think that a good chess application for Mac / Linux was LOOOOONG overdue.  Everyone knows Windows is good for gaming, but quite frankly, Xboard and SCID for the other systems leave a lot to be desired.

This Shredder, both the interface and the smoothness of the engine, is a breath of fresh air for those of us who refuse license agreements and viruses.