I think these are great if you follow the instructions. I like that D'Addario chose to make these in the USA.
I used it on 3 guitars and when I got them out of the cases, the necks had extreme convex bows. Scared the heck out of me. Luckily, they went back to normal in a few days. My guitars have been in many different climates, humidity and altitudes and the only time I ever had an extreme bow like that, was on a Bass after it rained and the humidity went to probably 100%. The bass wasn't in the rain just outside under a tent. So I don't use these Humidifiers anymore.
I really like item was easy to use and would recommend it to anyone who need to keep their acoustic in good shape
Just what I needed for maintaining humidity on an older ovation. I prefer using with an activation solution to maintain longer moisture retention.
This humidifier works great, and it is easy to re-soak the sponge. It is also $5.00-$10.00 cheaper here than at a store.
I started using this product because my old Yari Dreadnaught was beginning to crack.To my delight, after a couple of weeks, the sound became much crisper. For the money,ease of use,and great results I don't see any reason to spend a ton of money on anything more elaborate,this does just fine
I live in Madrid, in the center of Spain, with a really dry weather, specialy during the summer, when it is normal to reach more than 40ºC (104ºF).
I have really noticed a change even in the tone of my guitars using the humidifier.
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