The purifier runs very quiet and the lights can be turned off. Both great features for operation in the bedroom. I have been running the purifier for about three weeks and have noticed improvement in my breathing and reduced congestion when I wake up.
It's fairly quiet while having it on full blast. I feel for the money, it is worth it to have a great system with a lifetime warranty. So far, I've purchased 3 and will likely buy 2 more. I run all of them 24/7 and have vacuumed them every few days and WOW! The amount of dust and nastiness I vacuum off is amazing! I can't believe we were breathing that in before. I was so sick from September through Christmas and I couldn't figure out why. I'm pretty sure these help. I'd recommend them to everyone!