Ok, Short technical lesson, this is a Honeywell-labeled version of a popular Vicks humidifier, which is fine,'cause it qualifies for the GeekSquad extended warranty, which is worth purchasing for these units.
They _are_ well built, but there's a couple of caveats:
1) This is a steam unit, so there is a heating element, but they have no sacrificial anode, so if you have hard water, consider using distilled water in the unit to avoid scaling issues. (Plus distilled water at your local drug store is cheap.) If you can't manage distilled water, then using a good descaler every two or three uses is a good idea.
2) There is a medicine well at the top of the steam column, using this is marginally effective. You're better off using a vaporizer additive in the actual water. There are differences in how to go about this, so pay attention:
a) Vicks or Kaz products - are safe enough to mix in during the filling of the reservoir tank.
b) Generic additives, or anything oil based - You will probably want to premix your water, or possibly add it to the medicinal reservoir. You'll want to avoid adding these to your actual tank as these are petroleum-based products, and can potentially break down the acrylic in the water tank (and cloud the clear panels as well). An elegant solution a relative of mine had (who is a nurse), was to use an IV drip line for the additive, but I've not the space or patience to explain how to set that up. :)
3) Clean, dry, and inspect after each use. This is important. I've had three of these in the last 6 years, I kinda know what I'm talking about.
Since there is water + electricity going on, things will get corroded rather quickly unless you take steps to minimize corrosion. All the plastic parts can come off the "working" part of the unit, most are designed to be Dishwasher safe (on the top shelf). The base is not.
If you see mineral build-up, then use White Vinegar or CLR to clean it up quickly. Don't let it build up. Cheap alternative, just fill the machine with distilled water instead of using the tap.