Purchased Deetbot U2 PRO from the Ecovacs website. When we purchased it we were given the virtual demo (before purchase) they did not tell us that this model DOES NOT work on black/dark floors. After purchase, upon raising a complaint, the technical guy told us "How are we supposed to know your floor is black". And told us to tape the antidrop sensors. No one in the ecovacs team knows how to talk to their customers. The customer care representatives were shouting at us. Us, who were already so frustrated that we have to tape our product on the first day of purchase. I have never dealt with such horrible customer care where the customer care representatives have no decency or manners to talk to their customers. Very horrible experience. Extremely disappointed. Would NEVER recommend ecovacs to anyone.