My main device is an Air Max, pretty much the same as a solo, but more compact. I love it. I had the predecessor, the Air II but it died after a bad drop onto a cement floor that broke the display, no fault of the vape. It was excellent too, but the heater and battery life are better with the Max. The basic glass stem design used by the Arizer units is a gem. Contrary to the usual description, it is almost entirely a convection vape if loaded properly. I like being able to have multiple loaded and capped stems ready to go.