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I just purchased these a few days ago. They work pretty good. However, you can still sort of hear a small pitch of noise just around you or noise surrounding in your own cubicle. It depends if you have something thats turned on by you. Honestly I'd say these work pretty good. I'd grade this thing like at 98% for its effectiveness. It's 33db in which knowingly that's the maximum noise reduction rate.
Rating: 4 stars