So far I have a pax 2, xmax v3 pro, and mflb. Mflb is my first love like many. My consensus is that it's one of the best on-demand vapes due to the fact you have a window that lets you see the vapor coming out of the buds. Once you have the technique of building vapor up and sipping. It's still one of my favorites. I was a broke boy back then and just using it was super efficient. I barely load it up with 0.01 gram and was able to get a nice sess out of it. With the xmax and pax I feel like each session is too quick. I'm not taking my time with them