There is definitely a huge learning curve to these, mine doesn't get nearly the use that it ought to (probably because I have found the Mypressi Twist to be quicker and more consistent). The trick seems to be getting a rhythm so that the heat stays consistent. That being said, I can't say I have ever pulled 3 consecutive shots that were identical, and rarely 2. Someday I'm going to hook a 2-zone thermocouple to it, that might help. The wet rag trick is good when using the #2 switch setting. I do have a pressure gauge on mine, so that helps. I need to get a naked portafilter, too. That was something that I've been spoiled by.