A great example is refactoring. Say you hired a dev and he delivered a product that worked but is written terribly (already a question there, how do you gauge that in terms of 'results'?). Now you hire a second dev to clean it up and make it maintainable. How do you evaluate when he has delivered the 'results'?

edit: I think the closest thing to a true results based workplace would be an early stage startup. Everyone is invested in the product and striving towards creating it, not just putting in hours. In those cases people usually end up working WAY more than 40 hours a week.