Originally Posted by Evan!
If you're concerned, just go with the best
The rollers on the crankandstein are 1.5" diameter, where the barley crusher is 1.25". If the concern is roller diameter, this may not be the best choice.
Regardless, I think the homebrew shop owner is full of it. I know a lot of people, myself included, who have their own mills and having nothing but good things to say about them. This includes people with Barley Crushers, Crankandsteins, PhilMills, etc... You may get some husk shredding, but I'd guess that depends much more on gap, mill speed, etc...
Don't worry about not being able to form a good filter bed using a Crankandstein, you'll be just fine as long as you control the gap width and speed OK.