I received a Viva today. This is the worst yet. I didn't expect it to do what my Solo does, but this is really bad. I gets too hot, the hardest draw I've ever experienced, and leaves the material ready to be RE-vaporized in my Solo with much bigger clouds the second time around! My throat hurts, it is burned trying so hard to make this vaporizer work at full temperature. Too bad, the size, function, weight, etc. is fantastic. Also it won't hold the temperature, it says 430 but then if you turn the temp down and back up and starts up way lower. I'll stick with my IMAG for portable. Much better! Though it is a little too long and much heavier. Are there any smaller (pocket size) vaporizers that really work?