I spent a lot of time researching robot vacuum cleaners before I took the plunge and bought one for our home. Starting at 3000sqft of office and living space to tidy up, and with a dog that sheds 20 pounds of gray hair a day, I needed a bulletproof block. We have a variety of flooring types - carpet, bluestone, and hardwood - so the unit had to be versatile. I narrowed my criteria down to price, build quality, customer service (these machines often get scolded if you have pets), and dust box…