We bought the BreathSmart on 1/11/2016. It's now 2/24/2017. We use this filter in a space of approx. 1440 sqft. We also use 3M Filtrete 1500 in the central air system, but we don't run the system every day. Here's our thoughts:
Pros:
- Seems to help reduce the allergy symptoms, but doesn't do away with it.
- The lower fan speeds (1 & 2) is pretty quiet for sleeping
- Top layer of the filter can be hand washed

Cons:
- The filter life light never seems to change
- The higher fan speeds (3 & 4) are annoying loud for any time. We set it on high when we're not home.
- In the colder days the fan makes the room feel drafty
- The top layer of the filter warps after a couple of hand washing