I bought this 2 weeks ago. I should have stuck with the Vertex I had before. At least that model was reliable. This one, brand new, the battery almost immediately goes from 100% to 80% in the blink of an eye. I barely get 15 minutes of run time out of it and then it takes 3+ hours to get a full charge. I vacuum daily because I have 4 kids and a husband who works at a saw mill. My house isn't overy dirty but I want it to STAY that way. When I can barely get a room and a half done before the battery runs out that is a huge problem. Remember, I vacuum DAILY.  To top it all off I can't even get a second battery because it has been out of stock for 3 weeks since I ordered it. I previously had the Shark Vertex. It came with 2 batteries and I could get my whole house done. I'll give the Stratos two stars because it's cleaning power really is impressive. At least it is when it's working.