I really like ours.  Simple and effective.  Carry a couple 3/4's, a couple 15/16's, a hammer and a punch and you can field fix just about anything you may need to.  Adjustments and service are easy due to being able to lift the whole thing to eye level.  Never had any problems with the wheels running in the bean row, just have to be aware and those rows may or may not need to be set up a little differently.  Ben