This is a little louder than I expected - it has a sleep setting which helps, but I feel as if it makes the device work not as well when it is in that mode. I haven't noticed a reduction in dust or dander in my room either. I think the unit probably needs to be bigger.

用户的反馈问题可以总结为以下几点： 1. 设备的声音比预期的要大一些。 2. 虽然设备有睡眠模式可以帮助降低噪音，但在此模式下感觉设备运行效果不如其他模式好。 3. 用户并未注意到房间内的灰尘或皮屑减少。 4. 用户认为设备可能需要更大才能更有效地完成任务。