What really caught my eye about the Sauer 100 was the safety. As you can see in the picture below, it is a 3-position safety. All the way back locks both the trigger and the bolt, the middle notch locks the trigger, and all the way forward means the rifle is ready to fire.
This replicates the Mauser 96/98 “flag” safety in a more compact and convenient format. You can see the three positions of the Mauser 98 safety in the picture below.
I know this sounds like gun geekiness but it just appealed to me.