I really enjoyed the tear drop shape. Most of all I love that there is no light that stays on like most do (usually blue). I also like that they do not use blue for their buttons, it is a nice green that dims out. I used the vapor pad, totally a plus. Thinking is the pad reusable? It would be great if one was made so we can add our own scents. The low speed is a decent speed by itself. The design is easy to put together, no hassel!