I received my Tero device on October 29, 2021 and used it for the first time on November 1. After two weeks of use, I was greatly disappointed to see that the manufacturing and operating characteristics of the device that I had idealized did not meet my expectations. 1- The weight of the device overwhelmed me. I then understood why the shipping costs were so high. 2- I was surprised to learn that the anti-odour filter cartridge and the dust filter had to be replaced every 3 to 4 months. For me, this additional expense was not negligible. 3- The third point is major. It is the noise that the unit makes. The noise that my device makes is the noise made by two pieces of metal rubbing against each other when cold, a noise that makes you grind your teeth. Since this noise lasts for the entire time the machine is running, between 5 and 7 hours, it is quite unbearable not only for me but also for my wife. I sent my comments to Veronique, the customer service advisor, telling her that I had decided to give up using it. I promptly received an encouraging reply: "...I can certainly help you with the noise. It is indeed an unpleasant noise, you are right. Other users are also experiencing this noise and we are working on a solution. This noise is in fact produced when the blades rub on the bottom of the bucket, around the chimneys. I suggest you put vegetable oil on the blade holders and around the chimneys, at the bottom of the bucket. It is very important to get back to me if the noise persists and gets louder. I won't leave you like this, that's for sure! As for the anti-odour filters, you don't have to change them every 3-4 months. It's up to you, depending on what your nose tells you. They are used to prevent odours. You may very well be able to stretch your filters much longer!" The proposed solution to reduce the squeaking of the blades has proven to be positive, although for an octogenarian like me, the operation of oiling each time you use it is not very easy given the small size of the bucket. Considering the running time of between 5 and 8 hours, I find that there is still room for improvement. Honestly, I still find it difficult to stand the noise during all this time. I have to say that I was very excited to learn about this project in October 2019 and subscribed to the Kickstarter fundraising request. I do not regret my contribution to support the tremendous amount of work that went into making the TERO project a reality. What a great example of youth getting involved in protecting the environment!