Actually, I have to agree on this note... I have a Reo Mini sitting in a drawer right now(the form factor is not for me) that literally managed to sit in a nook on top of my car until I was doing 60mph down the highway, and then go flying off it. After 15 minutes of searching the road for the body, the door, the battery, and the atomizer, the end result was replacing the battery and atomizer. The Reo Mini was perfectly fine(albeit scuffed up).
If you intend to use rebuildables on it, I would suggest ordering extra battery springs. The Reo Mini uses a collapsible spring to prevent thermal runaway or whatever, so if the build isn't just right, *poof*, the spring becomes a pancake.