Cons:
I found that the Gripper sometimes dissappears in ViaCad 8 Pro. No matter what I do, it stays hidden or gone. Only after I added a primitive and deleated it again, the gripper was back.

Sometimes I can not do a push. It just don't work or don't recognise the edge as a face. Rotation in view sometimes help.

Pros:
I found that push to the wrong direction do a boolean.

A chamfer edge can be undone with push/pull.