I have a neato d4 robot vac that has 2 months use on it, sadly my tile floors grout is a little deep so it tends to get stuck in the kitchen and my wifes approval factor has gone down hill...I bought for 399, asking 225 shipped, still sells for over 500 bucks...this is a great vac that uses laser navagation and will map your home and can set virtual boundaries of where to go and not go and is arguably the best vac in its price range. I would not be getting rid of it had it not been for my tile floor. Any offers or questions let me know