I bought this aspirator for my 6 week old son. He was sectioned and has always had a congested nose and due to this feeding was difficult (he'd gulp in air when he couldn't breathe). Since I've used this we've not had that problem anymore! And it was a big problem! Although he did scream and cry when I used it poor bugger, I absolutely love this product and hearing him being able to breathe without any problems is perfect.
It is also really easy to clean. I just ran it under some hot tap water with soap and it was clean in minutes. I found that the filter was untouched after the first use so I didn't bother replacing it although this packet does come with 3 more filter replacements, I have a feeling they will last me a long time. I may even wash them rather than buy more filters.
Fantastic product, really easy to use and clean and very effective. Only downside is baby absolutely hates it but the results are worth him crying and screaming for 5 minutes :)