I have been using it in session mode starting at 350F and progressively ending up at 375F in three 3 minutes sessions. I hold the Unit a little tighter on the side of the D opening. Plus, I removed the D screen. I use a screen over the bowl to keep things a bit tidier. With the bubbler, it is kick ass. This vaporizer is not perfect, but it comes pretty close. A few more refinements and who knows?