This little thing packs a lot of vapor and works great in the cab. I've gone through two of them now since the first one finally bit the dust. The only problem I have is that the cable is not long enough. I plug it into my USB port on my computer tower at work and keep it on my desk. The reason I killed the first one is because if I turn too fast I'll knock him over. If the cord was a little longer I could get it out of the way. If you turn it over, the water will spill out and make a mess. If you're not a clumsy person, this is probably a 5 for you. It's quiet, runs off USB or you can plug it into an outlet, and it produces plenty of cool vapor that's so nice in a dry winter office.