I also have a Ferrari bottle filler. I watched a guy on youtube and that helped me figure out how to use it. The tiny little instruction sheet is not very good. I use mine with an autosiphon and it worked just as advertised. I've only used it to bottle one batch so far, but I'm happy with it. I also have a Blichmann Beer Gun to occasionally bottle beer from one of my kegs and I can tell you, the Ferrari filler is much easier to use. I noticed pretty quickly that once the bottle is full, that I needed to press the little release tabs on the side of the filler. If I did not, some wine would come out the top by the adjustment knob. The fill stops as advertised but the air leaving the bottle through the vent can still push out a little wine. After two bottles I figured that out and then placed about 6 bottles in to a 5 gallon bucket from Home Depot and filled them in quick succession. Every bottle was filled to the same level using this thing and I'll keep using it. I also splurged and bought a bag of 100 Zorks since I don't have a floor corker.