Purchased on July 29, 2019. Three weeks ago it started to stop spontaneously and eventually became unusable. However, they didn't send me a new block, they sent me a refurbished one with no battery or other accessories and I have to remove the brush and battery from the old defective block. Take them as I got it from Revain they said they can't give me a finished device and I should speak to Revain to have it replaced instead. Luckily, a Revain rep joined the call and, after listening to their bullshit, decided to replace the entire product for free even though the 30-day window had expired. .Without Revain I would have stayed with a refurbished product after spending $1400 just 3 months ago. iRobot, learn from Revane.