Instruct: Classify a review into positive or negative sentiment.
Query: Best invention since the wheel

Best appliance I have in the house. I just bought a new house with too much carpet and my 3 dogs love it. They were house trained but since I moved from a house that was all tile and hardwood floors they have been having pee parties nightly. My plan is to get rid of the carpeting anyway because I have asthma, but in the meantime I found this. What a miracle worker. I also got the refurbished model and as before with other refurbished items it was no different then buying something brand new. The only complaint is the price of the cleaning solution which can go quickly. So I am going to see if cheaper carpet cleaners solution will work. I have a feeling it will. I recommend this product for any household, pets or not.