Bests & Worsts Reviews from Amazon

We have been so pleased with the performance of the original Air-O-Swiss AOS 7145 Ultrasonic Humidifier - Cool Mist in our 300 sq.ft. bedroom that we decided to upgrade and put the 7145 in our son's room. The AOS 7147 is identical to the 7145 with some excellent additional features. I love the controls that provide; readings of the current humidity level, ability to set the desired target humidity level, and the ability to pre-heat the water to improve efficiency. The one thing about which I have a minor complaint is the mist output level control. The 7145 has a dial control that allows for a continuous adjustment of the mist output. The 7147 touch controls provide only 3 absolute settings: low, high & high+. Frankly, I prefer the continuously variable mist output control of the 7145. We are relegated to using well water which pretty much "eats up" wicks in evaporative type humidifiers, forcing frequent and costly replacements several times in a season. The mineral cartridge included with both the 7145 & the 7147 (but not needed where water is soft) does its job in treating hard water so the humidifier works as intended. In the end I find this to be a product well worth the cost. Maintenance is easy, expensive replacement wicks are unnecessary, and the humidifier is reliable. I highly recommend this to anyone, but especially where hard water is an issue. (Update 02/18/13) Still using this daily without any problems. Still gives whisper quiet operation (the less expensive 7145 is a bit noisy, but not loud). Because of its very quiet operation, this 7147 would be an excellent choice for a baby's or child's room. I did not mention in my original review that the humidifier flashes an icon when it needs cleaning, a nice convenience. I use the Air-O-Swiss EZ CAL Cleaner and Descaler - A7417 for thorough cleanings, but I find a regular rinse & brushing under warm water minimizes the need for this. (Update 01/05/14) Both machines still whisper quiet & working perfectly. Still very happy with these purchases.