I have an Arizer Solo that I have had for about 8 months now and I really like it. The battery lasts for multiple personal sessions, great taste, easy temp controls, small efficient chamber. I take this out with me if I need meds while I'm away from my house, camping, hiking, etc. From startup to vaped in less than 5 minutes. I had mine fired up in a bathroom stall one time and as I was leaving there was a cop coming out of a nearby stall. We exchanged pleasantries and went on our way. Try that with a doob. Sorry, but dont have any experiance with your selections.