"Excellent but be patient with it!"
I was in two minds about these, having read some of the reviews. I have a large built-in wardrobe which gets damp: I tried small, hanging dehumidifiers but they don't last long enough. I put one of these in and am amazed at how much water it has collected in the last month. The container is admittedly a bit fiddly to open and close but a bit of patience and it's done in 30 seconds! Another tip is not to expect visible overnight results: I thought it wasn't working but after a week or so the crystals had gone hard and there was liquid visible in the packets. Very pleased with the product.