I have only used Northern Brewer for pre-crushed grains. I bought an AG kit from them and got a 79% efficiency. It looked like they did a really nice crush on the grains I bought from them.
I decided to get a barley crusher and it was delivered on Monday. I used the factory setting and got a 79% efficiency with a beer I brewed yesterday. I got the barley crusher because crush is an important factor and I didn't want to leave it in the hands of someone else...
Fermenting: Grand Cru, Belgian Dubbel, Nut Brown Ale, Saison Sans Soul
Kegged: Honey Amber Ale, Centennial Blonde Ale,
Gone but not forgotten: Irish Red