I panicked and almost returned this after I opened it and found the sharp edges around the metal holes. Reading back through the reviews, I saw that at least a few other people had complained about the poor metal casting, saying the edges would tear the pasta and make the whole thing worthless. I decided to give it a try anyway. It ended up working pretty much like a charm. Here's what I learned along the way:
1. You need to flower the thing like you really mean it. I covered every bit of the metal with semolina flour before each batch. Most of them came out without any hassle, after I tipped the finished batch onto the counter quickly and forcefully. I tried white flour, a combo of white and semolina, and finally just semolina. The straight semolina was easiest and most effective, and that stuff just sinks to the bottom of the pot when you cook the ravioli.
2. On my Atlas machine, setting 6 worked well for me.
3. You shouldn't need to wet the pasta with water or egg whites. Just don't let it dry out before assembling (cover sheets with kitchen towels at all times). I used the recipe from Marcella Hazan's Classic Italian Cooking book - which calls for a Tbs of milk per three eggs, to make it a little stickier.
4. I found they could hold exactly one tablespoon of filling, but towards the end starting using slightly less than that to keep the filling from squishing out to the edges and compromising the seal. I scooped the filling with a tablespoon, then scooped out the tablespoon with a normal spoon right into the mold. It was pretty easy.
I'm docking a star because if you do end up with any sticking, the sharp edges are definitely going to make you want to break something, and it just seems like shoddy workmanship. Then again, the thing is pretty inexpensive. Wish I could give it 4.5 stars...