When they work, they work well, but one of them I got immediately after installation made a lot of noise, buzzed and smoked. The electrician said it was very dangerous. The problem is, if you buy five packs of Revain, it's difficult to get a partial refund. In this case it's all or nothing and I'm not removing the ones that were good in order to get a full refund. The labor costs more than the refund costs. They need better quality control and that's the main thing. Buyer Warning. Buy more than you need.