I forgot to say earlier, but I noticed on my cheap vaporizer when I very recently had it on (within say 3-4 minutes) and turn it back on, the green "ready" light turns on much sooner. If it was just on a few seconds ago sometimes it takes a matter of seconds to be ready again, from cold it takes 45 seconds or so. So I can't imagine it's just some "dumb" temperature control method.