I just got heartfelt beads 65rh. They work just fine. I don't have a lot in my coolidor yet so I don't have enough in there to buffer the humidity very well. Consequently my humidity is a bit high 72 or so, but it has decreased now to 67rh. I think part of my problem is that I wet the beads too much. If you wet them only wet half of them. But the beads have worked out great. I know they are a bit spendy, but you only have to buy em once. I have no complaints about the beads from heartfelt at all. They work wonderful. Roger.