We bought 3 of these humidifiers last year for all our bedrooms. Even though it was a big chunk of money, I was tired of continually having to buy replacement disposable filters for our previous humidifiers (Holmes). Three at a time got expensive!
We were so excited to use our Honeywell humidifiers, and they worked like a dream. During the winter our kids had serious coughs, and we could adjust the humidity output to make the room extremely humid for them, and keep it at a medium level for ourselves. They worked wonderfully, and I was 100% satisfied.
As time went on, I realized cleanning them was quite a chore, and using vinegar (to remove hardwater buildup) did nothing for the moldy smell. Rather than use the 1tsp of bleach (recommended), I found I had to use at least 1 cup to get rid of the mildew smell. After cleanning the filters like this about 6 times, they became quite degenerated, and no longer held enough water to get moisture adequately into the air.
Frustrated, I (then) read reviews and heard you could not buy replacement filters. However, I decided to call Honeywell myself, since I couldn't bring myself to throw away 3 expensive humidifiers. I called Honeywell's Customer Care (1-800-554-4558) and found out you CAN buy replacement filters, at $24.99 each, with 6.95 shipping (for any size order).
Despite the filter issue, my overall opinion is that these are still terrific humidifiers, and I'm glad to continue using ours. However, beware that the filter will not last the life of the machine even though it's considered to be a "permanent" filter. Going forward, I'm going to be sure to stay on top of cleanning mine out (at least every 2-3 weeks), in order to be able to use less bleach and extend the filter life.
Even if I do have to replace the filters every year or 2, in the long run it's still alot cheaper than buying disposable ones monthly. And you'll enjoy a very nice humidifier (with multiple humidity settings) in the process.