The iolite is also an excellent choice for a portable. Not as quiet as the LB, but someone would have to be in the same room with some quiet to hear the hissing it makes when reheating. Add about 6" or so of vape tubing, put it in a drink cup and you could vape outside in view of a cop or two and not get noticed. It's a little better as a 'vape as you go' device, while the LB is better in quiet places since it's totally silent.