I have been using the Swabbie for three weeks. No concerns so far. It works very well. This is not a criticism of Swabbie, but one thing any product of this type will not eliminate the need for is cleaning surfaces inside the cup, with the exception of the inside skimmer neck, where Swabbie does a great job. You will see a slow buildup of crud on the inside of the collection cup, and on the underside of the Swabbie lid, and also on the part of the blade that doesn't contact the skimmer neck. This means that for me, about once every two weeks I pull the Swabbie off and wipe off the crud with paper towels. But the Swabbie seems to be dependable so far. I would recommend it. You need to skim a bit wetter with it, per the Swabbie instructions, if you don't already. I think the Swabbie helps skimmers maintain a constant rate of foam production, not the declining level you see that accompanies a slow buildup of crud on the inside of the skimmer neck. Swabbie does its job.