Pluses: it humidifies air in small spaces very well (the effect is not as good in large areas like living rooms though). I mostly use it in my bedroom during nighttime (instead of my supernoisy AC) and noticed that I stopped waking up every morning with a stuffy nose! It's a total game changer for people with nasal congestion problems! Highly recommend!
Also, love the cute design and size: it's relatively small (perfect size for an office/computer desk).

Minuses: price (a bit expensive) and water needs to be filled quite often (once every 3-4 hours).