In addition to all the above, a hyd. top link is also useful for controlling FEL attachments mounted with an adapter on the 3pt hitch. I find it's quite handy for adjusting the angle on a set of forks. It makes it a snap to lift a pallet, especially on uneven ground.
When moving material, I can put a FEL bucket on the 3pt and back into the pile. In addition to doubling the amount of material I can carry in a single trip, it also makes good rear
ballast.
I also double the lift I can get with a 3pt boom.