A while back I picked this tool up thinking it would be great, offering constent results. Turned out it was cumbersome and awkward. The Morin tool is hard to keep steady for repeaded blows, so every time you strike it you must reposition it. One can set up the saw in the vise in a way that lets you rest the Morin tool on the vice, but it requires a lot of adjustments as you go. Furthermore it makes quick checks with a spider tool a bigger pain. A hand anvil is still my prefered tool. I can keep the anvil and spider in the same hand and make my set a lot faster.
The Morin can be helpfull for someone starting out though, so I keep it around for teaching.