I've been using my Prodigy for about 2 months now and I'm still blown away. I got the 4.5w motor bolt last month but don't even bother using it. The Prodigy/10w does it all. I have a fast hand so it works fine for soft blends and light shading and it is just magic packing in color. So clean and fast. What gets me is that I got the Amen around the same time, expecting to use it as a liner. The Prodigy lines so well that I don't even use my Amen.
More amazing still, I've never changed anything from the medium excenterand it works for everything. It is the only machine that lines rubbery female rib skin as perfectly as it lines a shoulder...no struggle. Obviously, I am really happy with the Prodigy.