"Excellent"
I had a really bad damp and mould problem in my bedroom to the extent that the condensation was running down the windows and had warped the window ledge and mould was constantly growing around the window and along the edge of the ceiling. I got the moisture trap at the beginning of December. Since then, I have barely had any mould or condensation. The moisture trap is very effective, but be patient. It takes a couple of weeks to start working, but since then, I have gone through the initial bag and a refill bag of crystals, so I would say they last about 5 weeks. The amount of moisture in the traps is quite impressive! The spout means it's easy to empty. Refilling was fiddly at first, but has now got easier, I think just due to use. For the price as well, I think it's an absolute bargain and am really impressed. Plus my room is free of mould, which can only be a good thing!