I have had my Eva-Dry units in for a while now. With a 300 and 500, there is absolutely no moisture issue! It takes about 2 weeks for the units to be "full" and then I just plug them into the wall for a few hours and put them back. These things are a miracle!
Kegged: Citra IPA
Fermenting: Dusseldorf Alt
Planned: Black IPA, Munich Helles, Belgian Golden Strong, IIPA, Serrano/Habanero Cream Ale...