We have some k-lines that we use in pasture grass. They are nice to use and move if you have a good square field. I don't think they would work for any crop besides grass either. They are nice because they are easy and fast to move with a four wheeler, but they can be a pain sometimes if you don't take care of them or have oddly shaped fields. Also, the sprinklers can get plugged easy if you don't have clean water or a good filter.
Gleaner is cleaner!