Probably not enough to get too excited about.
Here's a report of some trials done in MI. http://michigansoybean.org/wp-content/uploads/2015/08/2016-and-2017... Not everybody profits I guess. I'm sure there are more in depth and more recent trials out there. Maybe some in your area? I haven't tried it. I've said for a while I want to get a roller, but just haven't pulled the trigger. My main goal would be to flatten the cornstalks in no-till. | 
How close to emergence to roll beans
