Pros: I recently purchased three of these fans for my PC after realizing that my existing fans could be heard in the next room. With the new fans installed, I have to look twice at my PC to see if it is really running. I can't speak to their longevity since they are new, but so far, I'm impressed.

Cons: So far... None

Overall Review: These are the quietest classics fans I've ever used. A solid purchase.

Pros: The double pack is very economical and the dual mount is easy to use. I would certainly purchase these again, however, depending on the power connectors in your PC, It may be a challenge fitting a drive in the second slot. My connectors did not cooperate so I ended up using one slot in each mount. Since I had the additional drive slots in my case it made no difference to me.

Cons: I mentioned the power connector issue in the pros section since I consider it more of a space limitation of the 3.5" slot rather than the design of the dual mount, which is why my rating disregarded that issue.

Overall Review: I recommend this product as it came in a double pack. For the higher price of the single unit and in light of the space issue described above, definitely go with the double pack.