We use both versions (short and long). Short ones are for peas/lentils/etc., long ones for cereals. Agree that, if it's tough (early morning, and dusk) they pile up the vines, but are great the rest of the day. They have worked well for us and saved our bacon when we are trying to chase lentils that looked like they turned upside down because of too long out in the weather. Also fingers don't like bindweed/buckwheat. The long ones also are very good in lodged cereals. They are simple to adjust and change if one breaks or bends and you can carry a dozen replacements in one hand! It is a simple effective design IMO.