I have the Mityvac and like it. It's got a big enough translucent reservoir with markings every liter. 8 liters is roughly 8.5 quarts so you know exactly how much oil you've extracted. The first time I used mine, I heard hissing all over the place. Check the small short tubes. Push in on the light blue retainers, and the tubes come out. They should be square without burrs. I clipped mine square and reinserted them back, and now it works like a charm. Not something you should need to do with a new piece of gear, but it wasn't hard to do. The big translucent container is what sold me.